I've got the Hyperion VX packs at the moment, and like them a lot. However, for 'next seasons set-up' I will be buying the Thunderpower 45C G4 packs. I have used their hard-cased 40C packs in 10th off road, and I'm impressed.
I also have an iCharger 208B. The first was faulty, but Amainhobbies took care of me, paid for shipping etc. This one has charged my 5S 5500mAh Hyperion at 16.5A no problem!
The G4 Thunderpowers are also capable of 6C charging!