Check out these items.

[ReddyWatts]

I like these super capacitors that were designed for rc cars. Have a 24 amp rating with low impedence for lv controllers and a nice price. $3.95 Should run cooler.

http://www.hobbypartz.com/sucamoforxse.html

Water cooled 2945kv outrunner for a small hydro.

http://www.hobbypartz.com/88e-ads-300l-watercool-motor.html

[Jeff Wohlt]

I think they are the same as what himodel carries. Same price. But you get them faster at Hobbypartz.