On a full bolt on GT cams will get you anywhere from 25rwhp - 40rwhp.
The top three choices would probably be:
1) custom grinds from Modular Powerhouse
2) Cushman Stage 2's (VT)
3) HiTech Stage 2's
I would personally go with the HiTech's. They are new to the 2v cam scene, but all thier cars so far have put out over 300rwhp (full bolt ons + cams). If you're looking to be supecharged in the future, then you should get supercharger cams now so you don't have to change them once the supercharger comes. With supercharger cams on a n/a car you'll gain less than you would with n/a cams, but once you add a supercharger you can expect 60rwhp from the cams.
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2003 DSG Mustang GT 5spd
Full Bolt On's, Full Suspension, Built Rear
271/303
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