The other option if not the new a123 based pack, is the thunderpower 45C packs, 6s 3300mah, RCtoys.com is in my hometown so there won't be any shipping for me there. If anyone has used these packs and can post their experience, or better yet a discharge graph it would be greatly appreciated.
I have been cycling the old hyperion G3 35c packs i have about a dozen times but the difference in capacity of the two packs make them incompatible with each other... one is 2800+mah, and the other is around 3400mah, both 3s packs for a 6s config. Cell resistance over both packs are OK, pretty matched still, roughly 8 mohm for both, vs. 4mohm when they were new 3 years ago. Would still provide plenty of power by today's standards.