I would highly suggest going w/ the Neu 1515 1.5d, this is the best motor on a 4s setup you can find.. it is amazing! 50mph w/o temp issues at 4s lipo. You can run up to 6s w/o issues though at that point you are pushing 65-70mph (no joke).
Lipo's I would highly recommend going w/ the maxamps.com 2x 2s2p 8k with the hyperion 0610i duo charger.. amazing combo, a bit all at once but it is worth every penny! That charger is by far and away the best lipo charger on the market, but it does require a power supply; convert a pc supply or snag one from radio shack that is ready to go. You will need a Mamba Monster Max esc or a MM esc if you just want to stick w/ a 4s lipo config (best for racing) but with the MM you need an external BEC. The only other thing I can think of you will need would be a 5mm pinion w/ the 1.5d I would get a 22t pinion and the 58t spur.. awesome, I mean awesome combo! ohh and as you mentioned the single motor mount :)