Hi Pullstarter,
I initially run my savage with 12 cell 4200 intellect and the kit I used was Novak HV 4.5 (750watt), but the absorption of this motor was to big for this batteries and they damaged soon.
You can see a video of my savage with Novak 4.5 (but 4s lipo) here:
http://www.adicesare.altervista.org/video/
IMHO, Better of novak kit (and less expensive too!), I think you could consider a Mamba Max (+ubec) with a feigao 10 or 11XL, but you will not run very very fast.
Otherwise, if you take lipo cells, you could use my equal setup:
mamba max + UBEC
feigao 9XL
lipo 4s maxamps
47t plastic spure gear
16t pinion gear
With this setup, my savage run at max velocity of about 52 km/h (radar gun releved) with good torque.
Don't use a steel spur, the plastic one is better! With a steel spur you can break the pinion ore the motor shaft. (I did it too!)
Sorry me for my bad english.
Alex.