MMM Combo, 2200 or 2650?

[rotary rocket]

I need a bit of advice. I have read all about this combo (as much as I could find), but I'm still not clear as to which would be the right one to buy.

I am converting a 1/8 buggy to BL, and would like to use it in my E-maxx as well. Finally I want to use two of these combos in a converted 1/5 scale rally car.

In all three scenarios all will be using a 4s set up only. Would the 2200 allow me additional flexibility?

I have made a track in my back yard, so my set ups are for a "small track". It is only for fun, I don't need to go 50 + mph, don't need to race, etc. I need a reliable set up that would stay cool even in the heat of California summers.

Your advice is appreciated.

Cheers.