Motor comparisons:
http://www.innov8tivedesigns.com/Sco...ison%20Web.htm
R/C Dude Hobbies has been helpful in the past with answering power questions. You might give them a try:
http://www.rcdude.com/servlet/StoreFront
The folks at 3DHS (link already sent) are friendly and helpful.
Reaper Brushless is knowledgable and helpful.
http://www.reaperbrushless.com/