Thanks for all the responses. I will definitely have to look into the Dexters and Murrays. I like the Dexter's 4% milkfat. Yeah, I am thinking about just putting them on some rented acreage and shift them weekly to 4 or 5 different paddocks. Most of my "neighbors" are commercial dairies with holsteins and jerseys. I am actually getting raw milk from one of the jersey dairies now.
I was considering keeping a bull. Admittedly, I know nothing about cow breeding, etc. and have a ton to learn. And I like the idea at least of a bull with horns and when I butcher put the horns above a door to the shed or something.
Crossing does seem interesting, but I would like something that is, more or less, self propagating. If I have a bull and a few heifers I would not need to worry so much about finding a breeder, semen, embryo, etc.
Btw, do you think grazing chickens and pigs with the cows would work? I have not fully thought out the logistics, but was thinking about getting some pigs and chickens as well and thought it might be good to graze them all together. Obviously, I would need larger paddocks than if I had just the cows alone, but thought it could be interesting.