I would use a 4S2P 4000 setup of maxamps. The runtime will be great, with a very nice punch. You only need a LVC (low voltage cutoff) the nicest one i could find, for a cool price, is the liposhield from dimensionengineering.
Serum, thanks for the lead on the LVC. Now for chargers. I have a SuperBrain 977 that will charge up to a 3s lipo so I need a cell balancer. Or would I be better off purchasing a new charger? I would like to be able to charge at least 2 packs at a time.