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First I am a die hard VIPER fan, but I LOVE My 2001 C5!!!!
I have driven all 3 and here are my feelings about them:
VIPER---AWESOME enough said! But you will pay the price for this bad boy, but will need little modding to get where you want to be.
C5----I LOVE IT!!! Lots of power, but at the same time it is a daily driver and I love seeing heads turn and little kids pointing at car!!! Need some mods to get where you want to be
SVT Cobra---does make a good bit of power, but I haven't lost to one yet. Car does seem to pull hard, but all v8 mustangs have that "FEEL" of being fast! BUT it is still a mustang, kinda cheap feeling/looking. But the 04 cobra has the power.
MY VOTE-----VIPER if you have the $$$$$ to spend, C5 if you want an EXCELLENT all around, HEAD TURNING machine!!!!!!!!!
I would go with the Vette, add a intake, exhaust, cam, blower and ls1 edit and you should be where you want to be as far as ET. The viper is a beast but its too expensive to buy, insure and mod and the mustang other than bieng a ford handles like a bathtub compared to the c5. Good luck