ORIGINAL: rmenke
Alternative is a Webera 55speed, 10 X 10 apc prop after carefull breakin.
If one was to go the Webra 55 route, I think you may want to buy an APC 9X10 too. That should turn 16,000+RPM with 10% and a Jett tuned mufffler.
A OS 55AX will turn a 10X10 around 14,000 (air and ground rpm) with a tuned muffler/pipe but that prop/engine combo should only be used on a quick airframe or it will lug down in the air.
A Jett 90 LX will turn a 10X10 at 16,000.
A K&B 48 or a Thunder Tiger 46 Pro with a Jett tuned muffler and APC 9x7 or 9X8 will be cheapest and reasonably quick power I can think of.