Bozwth,
Powerflite is actually in Garland, I'm 30 minutes away from them. Go check it all out, they are pretty sweet. Downside is only that it will cost a little $$ to get set up with them, they take special chargers, and the packs arent too cheap either... But I LOVE them!
HighSierraHelis: I think a Brison 2.4 is way too much engine for this plane. A 120 pulls it around great, 2.4 wouldnt fit in the cowl, and it would pull the firewall out in no time. The 180 is as much engine I would think about putting in it.
As for the 225's. I would use only MG's on the ailerons. I would bet they nylon gears would strip on the first flight with the vibration these engines put out. Just my thought.