for a Brushless 6.5, you have a few choices really if you want a quick motor...
1) Speed Passion
2) Hacker/Losi
3) Others
The reason I list them like that is because I've been running them with Lipo in the touring car class all year long and time after time they've been the quickest motors out there (that have not blown up)
I've seen a number of Novak/LRP/Orion motors blow, but not one Hacker/Speed Passion yet.
If you are going to change the rotors, get yourself a few shims. I've found that changing between 12/12.5 and 13mm rotors the play in the motor was slightly different, so you need to add or take out shims
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