I'll second the trakpowers. They are made by flightpower and those are top notch packs. Don't let the fact that the Orions have Kokam cells in them fool you. The cells in the Orion packs are NOT the same cells that Kokam uses in their 4800 4S packs. The Orion 4800 is only a 15C pack and is a 2S2P config., although the smaller capacity pack that they sell is a 20C pack.

I'm not very familiar with the Novak setup that you are running, but if it isn't too hot, you could consider the maxamps packs. The 2S2P 8000mAh pack is nice for the price. On the other hand, the trakpower comes encased in that plastic. That's definitely a plus. I've lost enough $200 or so packs to crash damage to be able to appreciate the protection that the case gives.