Here, you can get some killer deals for some clearance, old stock Hyperion packs...
http://aircraft-world.com/shopexd.asp?id=4267 25C, 4350mah, 2-6s packs
http://aircraft-world.com/shopexd.asp?id=4959 30C, 4500mah, 2-6s packs
IMO, I would try the VZ 30C packs, the 25C packs I have aren't the best matched packs, they do perform, but the balance is not so great. These are both Enerland based packs, so you know you are getting good quality cells in your packs.