Your best move is to call Tim at P.I.S. He will give you all the time and answers you need to make a very educated decision.
Not only that but his stuff is the best on the market
i second that, ive heard nothing but good reviews on his product & customer service.. when i get enough pennys saved up he will be my builder of choice.... also some other good people are swamps, full force, and rosewood.. price all depends on how big you want to go
2002 7.3 with the basics.... 4in tb, cold air, dp tuned, autometer pillar... feel free to make donations