I'd go with 2 dwarf goats bred at opposite times of the year. That way you'd always have milk and the goats would have friends. Extra milk can make butter, ice cream, cheese, soap, lotion. Maybe your neighbor would breed them to his buck.
I don't know where you are, but most rural areas have a feed mill somewhere close by; It's almost always cheaper to get feed there.
I don't know where you are, but most rural areas have a feed mill somewhere close by; It's almost always cheaper to get feed there.