[MetalMan]

I have heard that each GP300 cell is capable of 100watts (1volt at 100amps). This would definately have to be for peaks though.

Now on to the Lipos. 100amps burst is not a problem. Anything ~4500mah 10C would be good enough. Remember, bursts aren't all the time, and 45amps continuous should be good enough. A Polyquest 2s 4400mah pack would be fine, a Maxamps 2s 4500mah pack would fine, a Thunder Power Prolite 2s 4000mah pack would be fine, etc.

Paralleling a pack will give twice the capacity and twice the amp handling capabilities. Also, since the pack can handle higher amperages, the voltage drop would be less, resulting in what could appear as more power.