Which pinion for e-maxx?

[shaunsmaxx]

That was pretty good Coolhand! LOL
Now for my question... I have 62, 66, and 70 t spurs and 14, 16, and 18t pinions. Which combo should I use to get the most speed out of my 9918/9L on 12 and 14 3300 cells?
Any suggestions on a motor that will work with my speedo for pure speed?
I run a mostly stock maxx that's extended 3"( keeps the front end down) and has driveshaft upgrades. It also has mad force tires on it(clod size).

Thanks, Shaun