Hey, have you guys seen or heard anything about the Tekin R1 Pro ESC? Here's a link:
http://www.teamtekin.com/R1%20and%20R1%20Pro.asp
The R1 Pro says it will handle 5s lipos. I have no idea on how many amps it's set up to handle, and I don't even know if it's on the market yet. Just FYI.