moamps said:
Exactly. The LM7812 gets very, VERY hot
if enough current is being drawn and/or if the input voltage is anything above 18v! Put a heatsink on that hummer and it'll SHINE! 
It'll run very well with even a tiny heatsink. The variable regulators can get hot, but not as hot as the standard ones. The variable regulators have a 5A output and the LM78/s/xx/LM9/s/sxx (the standard ones) only have about 1-1.5A output! How do you figure that?
I would still go with either no regulator and just do what the kit says, or run it through a POSITIVE variable regulator (and a NEGATIVE variable regulator if you need to have the +/- balance perfected
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