I know $ is usually tight but it pays to buy top end stuff and only buy it once! See what Lipos are in stock at
www.neumotors.com they are some of the best out there and prices aren't to bad even on the new 5c charge lipos. also check in the RC-Monster store, if Mike doesn't have it in stock send him an e-mail Medusa motors are among some of the best so that would be a step in the right direction.