I have a pair of 3500mah 4S 30c - 50C packs that will fit the E Revo or the E maxx.
This makes for a 8S setup that will push 105 amps continous, 175 amps Burst.
I've been running them parallel to make 4S at 7000mah.
I would like to see this coupled with a 1100kv 80mm Medusa on 8S.
Efficiency out the wazooo.
Yes there are other options, but to compromise and settle for anything less would be a crime.
The MMM software is unbeatable.