Losi 8ight Buggy setup?

After seeing GD's 8ight buggy and a few others I decided to convert one myself. I recently got myself one off ebay. The big turnbuckles and big shocks make it like a great little buggy.

I'm going to need a good setup, something that runs pretty cool. That would be the most important part because it will be run in over 100*F temps. Then being light weight would also be good. I just need average speeds 35-40MPH.

I'm planning on putting the motor on one side and lots of space for a Lipo pack on the other. I was thinking of a MM and Lehner motor.

One problem I've seen with one pack setups is overheating the lipo towards the end of the run. In my old MBX, even with a Flight Power 4s 3700 and many different setups and gearing I have yet to beat the heat problem.

So, I need a cool running light weight motor that works good with the MM and lipo pack that can handle the demands. What would you guys recommend?