$600?!?! Thats how much I paid for, for my turbo setup and ECU and Caltune on the ECU.
As far as going electric, More power doesn't necessarily mean more speed. By this I mean, adding more batteries, means more power, but also means more weight. Look for batteries with the highest voltage AND mAh, with the least amount of weight.
Voltage=power
mAh (mili amps)= how long the batteries will last on a charge.