Dude, you can waste all the money you want on a bike rack. If you just want something affordable that works get one of these:
http://www.amazon.com/Allen-Sports-D...ck+hitch&psc=1
Only problem I've had with mine is the manufacturer expects owner to permanently bolt this thing through the hitch - pin hole. So, you have to drill the damn thing out to accept a standard 5/8" removable hitch pin.