So with that said, a 2s-20c lipo that is over heating on a hotter motor setup would fare better with a 2s-40c or maybe even a 3s-20c lipo as along as the ESC is rated for the higher voltage from the cells?

I guess that makes more sense now. So if the battery is being drained and overheating by a hotter motor then you must "feed" the motor with more power to produce efficient temps and over all performance. So its not far off from Nimh and brushed setups then.

What are some good Sensorless motors out there?

You think I can put a Lehner 5300 in a slash, I mean; will it fit? Where is a good place to buy Lehner motors?

Ray