You can't go wrong with most any Sig kit. I'd build the 4*40. It's in your price range and it's a fun plane stock that you can modify like crazy and not worry to much if it's gonna fly. ChuckW's list of building stuff is on the money, but be creative most of the things you need to build any kit are near by and cheap. Home Depot is a great hobby shop but check their scrap bin first.

If you want something more "go fast turn right" an old school, check out a Sig Kougar.