RE: GP Electrostreak
I built one from plans at 22oz it is a great flyer. I lightened up the design considerably. My power system is a Mega 16/15/6 turning an APCE 8X6 on a 3S 2100 LiPo.
If you are building it stock, a 22/20/3 turning an 8X6 on a 3S 4200 LiPo will do great. Use a Castle Phx 45 esc.