e-maxx user looking to go brushless need opinions

I have my e-maxx which has a g1 single speed conversion, steel idlers, and ue rear cvds. Ill be runnign 14 cells which are ib3800's (2x7 cell packs). Ive looked at the hv novak stuff and thought about it but it limits me for upgrading in the future. I have also thought of the 9920/9xl setup which seems preety common and decent. I really like the mamba maxx esc cause you can program it via pc and its a few bucks cheaper. What are your guys opinoins and suggestions of what I should do. Im looking to stay right under $300 for esc and motor cause i'm preety sure ill need center cvds and have to beef up my rear diff. Thanks.