Fried Hv-maxx, what now...

[Ozmaxx]

The short story is that I fried my novak esc and I need a new set up. The 4400 was boring me bit anyway. Here is what I have -

MIP CVDs all round
Steel idlers
Alloy diff cups and diff cases
Alloy Bulks
2 speed transmission
RPM arms, towers and skids

Only been running 12 cell 4000mah nimh (still got 3 sets that are good)

I want a good reliable setup. Had the 9920 in mind, but not sure what motor to run, 7xl, 8xl, 9xl etc.

Which motors run well on a lower number of cells, 12 -14?

Is it worthwhile to get an extended chassis and take more cells? I mean I'm going to be spending on a new setup anyway.

Any suggestions would be great.