A Saito .72 would be nice. I have an OS.52 in mine and can do hammerheads, rolls, loops with a gather-speed dive. The more I fly the more I like it, but a .72 would offer some reserve power if you are into mild aerobatics or float flying.

Check the leading edge covering to be sure there is adequate overlap and it is ironed down solidly.

I recommend that you use aileron differential (more up throw on the one side than down on the otherside; by 50% or so). This seemed to tame the turns quite a bit. So far I can't tell if coupled rudder to ailerons is much help since I programmed in aileron differential.
Have Fun!!!!