Maybe the UCD .46 and the motor you already have. I have flown one with a saito .91 on the front and you would have never known that it had such a large motor on it. However, the magnum weighs more than the saito does and produces less power.

If you go with that extreme flight extra posted above I would put a saito 1.00 or a Y.S. 1.10 on it for true all out 3D performance. I always say there is not use in buying a Jam up airplane if you dont have a Jam up motor on the front