The PolyQuest lipo you linked are made by Enerland which is supposed to be one of the best cells in the business. There's been a discussion on RCM about the new 30C rated pacs however. Seems people are getting better performance from the 25C line of PQs than the 30C. I don't know what the prob is. but those trying the 30Cs haven't been happy with them compared with the 25Cs.

Others use the Enerland cells for their pacs and there are Kokam (also high quality cells) based lipo pacs as well. Any of these should deliver the best in performance and cell life.