flybike,
Check this link out for all available kits on the market...
http://www.pylonworld.com/rc_pylon/q...500_planes.htm
As for Jett Engines... It's just the diference in size and power. And for Reliability and Power, there's no engine's better, period.
A matter fact, I've just spend $400.00 today for a new BSE Quickie .40 AAC. Gotta love speed, huh? It cost a whole lot.
Sam S.