Hi Andy,
What utility are you looking for? Milking goat, meat goat, harness goat? There are lots of different types of utilities.
If you are looking for milking goats, with the possibility of keeping some of the offspring to go in the freezer, then I recommend getting some female Anglo-Nubian or British Saanens, then crossing them with a Boer male, which will give you meat from the crossed kids, and milk from the females.
It depends how you intend to keep your goats how much acrage they will need. For example, we have 16 goats and their field isn't much over 1/2 an acre. But they are kept inside a fair amount of the time, at least for 12 hours a day, and in winter, often aren't out side at all, except for a quick walk/exercise.
But if those same 16 goats were to be kept predominately outside, with access to a shed, that field would not be big enough.
Beth