Mod Help

I have a 2002 Mustang GT and I am lookin to start buying parts so I can start working on my motor.  What I'm looking to do is rebuild the bottom end and put a decent set of 3V head on it and convert it to DOHC.  I like the cams that Comp Cams offers and that were used on the white GT in the Aug 08 edition I believe it was.  I am pretty much lookin to do that exact build but with a few quirks and adjustments here and there to make the motor a little bit beefier to eventually handle more power.  At first I'm looking to be somewhere in the neighborhood of 500 at the wheels.  Also instead of the single turbo I'm lookin to do either a twin turbo or Kenne Bell supercharger kit on the car.  I do realize that along with all of this I will have to do the injectors, fuel pump, and would like to do the Intake manifold and a new Mass Air sensor.  Any suggestions on where to look for good quality parts?  
02 Mustang GT-Sonic Blue 17x10 chrome Cobra Rims, 275/40's all around, PYPES Violator Exhaust, K&N Mass Air Intake