* Replaced the Servo library with one (MegaServo) by Michael Margolis. Supports up to 12 servos on most Arduino boards and 48 on the Mega.
Isn't it correct that since the newest arduino release one can use the STANDARD servo library (servo.h) to control up to 12 servos?
I would definitely suggest you look for an old AT-style PC to scavenge a power supply from first. An AT is better than an ATX because you're more likely to find one for free, and its main output will be 5V, instead of 3.3V.
But you can depend on the sequence of the wires in the connectors, because anyone who didn't follow that standard would start fires