Did you ever think of trying an electric plane? Nitro planes has several with motors for 100$ or less. Course that doesn't include the radio. I was just in another thread and someone recommended this one:
http://www3.towerhobbies.com/cgi-bin...=LXNVC0**&P=ML
Complete with radio and first batteries. Charger is a slow charger but you can upgrade later and still be flying now.
Just a thought for you.