RE: Edge 540 - Extreme Flight
YS .63 would be a good choice as it has a pressurized fuel delivery system that allows you to get a better C/G tank position. HS85 MG servos would be more than ample in speed ranges less than 25MPH.
Thunderpower LiPOly packs are hot item now, their 3cell packs do not even have balancing tabs which seems strange......