If you can afford a four stroke, buy one. There's a guy at the field flying an LT40 with an OS 70 Surpass four stroke, and it'll fly with 1/4 throttle, BUT the engine will serve you well for a long time.

I'd also recommend spending the extra money for the Futaba 7C series transmitter. The Futaba 6 EXA is a decent first computer transmitter, but is lacking in some departments.

Good luck, and welcome to RCU!
Dennis-