You look at Spad's yet?
http://www.spadtothebone.com/SPAD/
Planes can be built for under $30. Find a decent used motor and a functioning radio and you're flying. I know guys who only fly these plastic wonders and they're having a blast. I fly the more traditional material models (balsa with built up wings covered in film), but I'm even thinking of making a Debonair, just to have something to knock around with on a windy day. Take a look at them.