when we first moved to our 31 acre farm in northern virginia there was a combination of 4ft wire cattle fencing on the perimeter and 5ft board horse fencing in other areas. i wanted a secure garden area and a separate orchard area. we used 6ft deer fencing which was a plastic coated metal on 8ft T posts. the corners and gate entrances were wood. we strung two wires above the deer fencing and it is working very well going on the third year. it did get a little loose over time and we had to pin it down into the ground in a couple of places. we used to see deer all the time here when we first moved in, singles, moms with babes and groups. i once saw 32 deer walking in a line right through our farm. a neighbor told me it was part of the trail they use when they come down from the mountain into our valley.
we have fenced 8 pastures for our sheep and llamas and 3 for our goats and they cut off their trail. we have 3 dogs that are out during the day and in at night. i believe their presence and the fencing have made them try a new path somewhere else. we have only seen one deer and always the same one. we see it at the upper pond with our male miniature horse. apparently they have become friends and we often see them standing together and eating. this is in an area that is wooded and only has the 4ft fence. so i guess i am saying that for us, we just deer fenced the areas that were important for us and what we could afford. i am not sure but i think it was about $1000 to $2000 for all the fencing, wire, t-posts, wood, small gates my hubby made of wood and the big metal gate so we could drive the tractor in. my hubby, son, and daughter did it themselves. i am sure you will find what works best for you. take your time if you can and really think about your options. i have found that as we improve the farm, i have an idea about what, how, or where i want something done and then i change my mind for the better:)