The setup for the airfoilz is what I was referring to with a 30 amp esc and 300 watt motor plus the battery. this site says you can get away with a smaller motor.
I have the Edge 540 and it flew great on a 260 watt motor. It's little on the heavy side now from doinking it in a few times.
I would save up and just keep flying that plane you have learn it inside and out,and have fun with it.
Some one else will chime in on what to use your power setup on great bunch of wattheads here.