Here is the ESC I am getting:
http://www.maytech.cn/eng/proesc.asp?type=6
It is the 200A 10S HV ESC $257 shipped with USB programmer. Several of the fast electric boat guys are saying good things about it. Dual 10 guage power and motor wires. I have some 12V computer fans to try for cooling + I might try the peltier also. The ESC is waterproof so I wouldn't think condensation to be an issue. I don't think there will be much, if any, anyway since the ESC will be warm.