I got your PM. I would be glad to help. Here is my only reasoning of why its worth going the V6 route over the V8. Much cheaper car insurance. As far as the gas mileage, different people will say different things, but I thought I got pretty good gas mileage.
I just recently sold my car, but just before I sold it I put a new motor in it. The car has right around 6,000 miles on it now. The V6 motors are dirt cheap (which is a good thing if anything goes wrong). Basically look at spending around 5-6k for a good turbo setup including the upgraded fuel system. You will be in the mid 300's to the wheel on low psi.
I drove the hell out of my car, steppin' on it just about everyday. Not a single thing went wrong. I only replaced the engine cause it was hard to sell the car with such high miles. So all you would need is the turbo kit, upgraded fuel system, and a rear-end (which I never did).
Go to
TMA TURBO tell him Sai sent you, and he will help you out with the rest.