If you are looking for a decent used pair, I agree Slowtwitch classifieds are the way to go. If you want new on a budget, check out Neuvation Wheels:
http://www.neuvationcycling.com/. I've hear nothing but good things about these very reasonably priced racing wheels. If the Neuvations are still out of your price range, check out the standard house wheels at Nahsbar or Performance. These aren't going to be the lightest or the coolest, but I understand they are fairly bullet proof.