[scarletboa]

take a look at this for a cheap 4s esc.

http://www.nitrorcx.com/ezrun-80a-sd...e-rc-cars.html

or, you can get it with a motor equivalent to a feigao 7xl with a very nice heatsink and fan.
http://www.nitrorcx.com/ezrun-brushl...-combo-c2.html

i've seen e-maxxs with that system and temps are nice and low. it should work nicely for that truggy.

or, if you want to get a medusa motor, get the 150a version of that esc. it can handle more power than the MMM.
http://www.nitrorcx.com/ezrun-150a-s...5-rc-cars.html