I never drove a S/C cobra but I think the GTO and the Cobra run very similar numbers (both stock), I used to have a 99 Cobra and the interior was crap, the seats probably came from sick cows, and the dash was very ugly, but I loved that car, It souded awesome and run very good(not compared to the GTO of course), and I did not want a 04 Cobra because they are very expencive for a used car and I hate the interior on these models.
But the GTO is just awesome, the seats are great very sporty and suportive, car is comfortable and very, very fast, plus I got the last yellow 6spd on florida, 2006 models don't have yellow anymore.... they said because I got one of the last 2005 I got a good discount and the car run me for about $28900.00 I think it's a great price for this car, considering that is far, far superior than the new Mustang GT ( yes I test drive one), I just wanted a fast car around 30K I always loved the GTO and the STi, but gotta love the v8