RE: What LIPO do you use?
So far I've bought all of my LiPo's from Heads-Up-RC and they have performed just as well as the "name brands" like Tower-Pro, but at a fraction of the price. Most of the flyers at my field have switched to the really cheap LiPos from HobbyCity, and have found them to be just as good as the name-brands as well. If you buy from them, make sure that there is a positive quantity listed. A negative quantity means that they are on backorder and you may have to wait a month or more to get your batteries.