Budget intended conversion

Hi guys i used to run nitro but ever since i bought my e-maxx a week ago i love it!!! Well i want to convert my st-rr but budget oriented because i just bought a e-maxx which will be stock forever. Ok anyways I found 2 esc's and i will be sticking too a 4s lipo setup but i will be running two 2s lipos i will race truggy but not that much. Now here are the 2 esc's
Either mamba max with 2fans
or this...read good things on it, which i will probably get!!
http://www.rc-monster.com/proddetail...rod=HW80ampesc

Now for the motor ?
A medusa but what kind?
Or a speedpassion 8.5t 2200kv
Fieego 8xl/9xl

*Please help guys I have been 2 rctech and they dont help for &*&*(