i'd get the 96-98 Cobra....u've got a better platform to work with. Responds better to mods and what not.
a 99+ GT is a pretty decent car, and is a little cheaper tp mod then a Cobra.
the 97GT with a S/C has it's pro's and con's Depending on the price, mileage and mods, it may be a great buy, or some fools disaster... a NPI GT with a S/C and exhuast is only puting down 300 to the wheels. If u put parts from a 99+ cams n intake manifold u could see an additional 75 rwhp, or u could even go with an aftermarket cam and get 100hp instead of 75.
U should find out if the 97 has more mods, or even more details on it. If it's been dynotuned or evem tuned for that matter. U don't want to buy a car, start modding it, and find out the mods been done.
buying a car thats got mods is a coin toss man. I would try to jump on the 97 GT with the Pro Charger or the Cobra. All 3 cars within a half second of eachother.
97 GT S?C 13.2-13.7 depending on the suspension and gears. If u suck at driving and can't hook with that much power u might wind up just spinnng.
99+ GT 14.1-14.3 depending on how u drive...a lot of them even have basic mods like cat back and pulleys and CAI
SN95 Cobra 13.8-14.1 depending on driver
Starting with something faster is ussually better, because u wont have to spend money to make it that fast, it already is. If u can get some detail and whatnot on the 97 and she's not over priced, jump on it, otherwise get the cobra....stock 99+ GTs are a dime a dozen...