I would go with either a Novak GTB 6.5 or 7.5 or a Castle Creations Mamba Max with a 5700 or 6900 kv motor, pair either one of those up with a max amps 6000 mah 7.4 volt lipo battery and you will have a sreamen machine....
Both of those systems are pretty dead on as far as rpm goes, The Novak is sensored, the Castle Creations is not sensored, the Novak can be used with both brushless and brushed motors, both are programable and have lipo battery low voltage cut offs...here are a couple of links...