A
landrace goat acclimatized to your area is going to do a whole lot better than a specific breed. Although if you fall in love with a breed or are interested in preserving one of the endangered varieties, there is no reason to avoid a specific breed. I'm exceptionally partial to the Oberhaslis myself, for their ease of care, calm personality, consistent quality of milk. They are a duel purpose, very old, very endangered breed. I think we have 25 in Canada now, up from 7 a few years ago.
What's really important to consider when getting goats, is that the quality of care matters a whole lot more than the actual breed. My primary goat guru has Saanens that produce on average a gallon and a half of milk per day, with a higher butter fat count than any other breed standard. This is exceptional! This particular goat guru is consulted by Veterinarians around the world regarding goat care, and I'm so very lucky to live in the same town as her. Her success is due primarily to her mineral and feeding programme, but also because she's been breeding this line for over 40 years. She never stops learning, and when she does research, it's actual research - not just reading a few
books, but actually experimenting with different handling techniques and mineral programmes by separating her herd into control group, &c.
All milk and duel goat breeds can make exceptional cheese - breed is less important than care.
This takes us to the first thing you need to do if you are considering thinking of getting goats (or any large livestock):
Find a guru! Find one you trust. Look at his/her flock and see if the animals look lively, calm (not the opposite of lively), curious, alert, &c. Ask your would be guru about things you've read about goats and their care. If your guru disagrees with what was written (which is likely if they've been at it a while) then ask them to explain why - if they can offer support for their point of view, then this is a good sign.
Having a guru that is in your area will not only help with developing your goats nutritional pattern but also save you buckets on vet bills (mostly through prevention, but also by teaching you when to panic and call the vet, and when it's just one of those goat things).
Next step -
Find a vet that will actually work with goats! This is not easy in most parts of the world.
From the OP, I don't know if you've realized this yet, but
goats do not need to breed every year to produce milk. A goat, given proper nutrition and milking schedule can produce milk for many years before needing to be freshened again. My guru has gone for 8 or more years between freshening, although my herd, I plan for 3 to 5 years. My plan is to eventually average 2 or 3 girls, then give each one a year off before breeding again. Given the right nutrition (I seem to be repeating myself here) it can be easier on the animal to give milk a few years than to birth a new kid every year. Also, when the goat is pregnant it will stop producing milk... the longer you let it dry up, the more energy it will have for making the kid.
Nutrition: Know your local minerals excesses and deficits in your land. Regional is a good start, but an investment in your actual soil mineral profile will go a long way to keeping your goats healthy. Whatever your management practices, you will need to supplement minerals and
feed; however, looking at your goals and that you asked on Permies forum, I think the book for you would be
Pat Coleby's Natural Goat Care. Her focus is in managing the pasture/feed crops - by ensuring the food the goats eat is the most nutritious, you don't need to supplement as many minerals. Different mineral deficiencies cause different ailments in animals - sort of, exactly like humans - for example, Selenium deficiency is the primary cause of infection, especially udder infections. Copper is suppose to be excellent to prevent parasites... and so on and so forth. By adding or not adding certain things to your land (avoiding
petroleum based fertilizers for example), Coleby says you can drastically alter the amount of nutrition available to the goats. Please note, she's writing for Australia, so if you live elsewhere, it's important to know your local mineral issues. Her information is in depth and includes the background of why she says what. With just a little
common sense, what she writes can be adapted to anywhere in the world.
All this about nutrition and care is well and good. But you asked about breed, so I'll end on a few of my personal observations.
Saanens are good milk and taste, but can be a bit intelligent for a beginner goat keeper.
Nubians are the loudest creature you could possibly own, and I'm not entirely certain their good qualities make up for the noise they make. Even 1/8th Nubian will make one heck of a racket when unhappy. If you were where I am right now, you would be hearing what a tempest of sound a 1/16th Nubian can create. The only upside of them, is that it pisses off my neighbours who are right arses and deserve to learn that farms make noise (the neighbours started it and did far worse to us). But if you want to stay friends with the people next door, maybe consider a different breed. (I'm a wee bit predigest against Nubian goats mostly because of the noise - they actually do have good qualities, I'm told).
Oberhasli and Oberhasli Grade are by far my current favourite. They have a gentle voice and gentle nature. Excellent meat and milk. Oberhasli Grade and Oberhasli Experimental are basically goats with Ober genetics in them, but don't match breed standards. Maybe they aren't enough Ober percentage in their parentage, or more likely they are simply the wrong colour. Being born the wrong colour usually means that the otherwise healthy goat gets to spend the rest of it's life in the slaughterhouse. One option is that you could rescue a couple like this, then breed up for full breed status.
Those short little goats so popular at petting zoos: Personally these can cause a lot of trouble, not because of the goat themselves, but because of illness they get at the petting zoo. The local petting zoo is responsible for a pandemic of goat illness in our area. What happens is that the petting zoo accepts all sorts of farm animals from all sorts of farms without doing health checks on the animal first. Then people pet the sick animals, then pet the mini goats. Mini goats get sick, but don't show it right away. When the mini goats grow up into adult mini goats, then they get sold to new farmers... new farmers don't know the regular diseases goats get, so they don't look for the symptoms... problem spreads! and so on and so forth.
There is a lot to be said for
hybrid vigor when considering where to start your herd.
Basically, when you get your goat - be very picky. Buy only from a trusted source. Whether you are new to livestock or have 40 years under your belt, when you buy your critter, spend at least half the time accessing the farmer. Ask them questions, challenge their knowledge, &c.
Buy the farmer, not the livestock. A great quality animal can be damaged beyond hope with the wrong care.
This post is long enough. If you want my full opinions on fencing and buying, let me know. But right now I have a noisy goat-ling to feed.