First decision is the electric/Gas choice. Once you get past that check out this site.
Golf carts for sale both new and used as well as gas and electric.
Compare prices on there and then go looking. what you get is up to you.
Personally I just bought a gas Yamaha off of the classifieds here.
If your not sure of the quality of what your getting and don't know how to check out the cart. Call one of the local golf cart mechanics to check it out for a small fee of course.
Good Luck