the only real reason i dont like the gt500 is because i cant stand shelby, from what ive read, shelby sounds like a real prick. charging people for autographs and suing people over name infractions etc. not to mention ford canned SVT to give shelby, saleen, rousch etc. the job of making special vehicles. look at what SVT had for us, 03/04 cobras, lightnings, focuses, contours, etc. a pretty cool list of vehicles no matter what you wanted, and you didnt pay an extra 10k for some old fart's last name on your trunk. i think this has done a part to ruin ford and put them where they are right now, at least from a performance enthusiast's perspective.
shelby's cars arent that cool, SVT could have done way better imo, and on top of that, i havent seen a single s197 done by saleen or rousch that even looked remotely tasteful. saleen's body kits are the ugliest things ive ever seen.
either way, i totally vote for the 347!