I can agree with montague on this one..
For a deciently cheap class A motor go with the .15 CVA, This has lots of power for a half way decient price. The price is a little on the expenive side, but the quality is A+. I have this motor in my Lanier Ripper and it really makes it move. Remove the baffle, and it really screams.
Though only if i could keep the plane in the air. Now thats a differant story!