Fish-
If modding is your problem, then dont buy an F-Body cause I know that you will be going just as crazy. These cars are just as addicting cause you can make great HP, just ask Horist...
I know the insurance is killer on V-8's so if that is your purchasing dilema then get something a little scaled back till your next automobile purchase (after you are 25)
My theory is...once a modder always a modder, no matter what car you purchase you are going to look everywhere for aftermarket parts and accessories. If you are unsatisfied with the GT and really want power go with the LS1's they are great, if not get something that will satisfy your HP craving till you can afford the '06 Vette Z06
500HP got to love that! I know whenever I need to have some fun, I hang up my GTP keys and go for a quick spin in the TA...fun driving
God I love that car...
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Good luck shopping around...