In my opinion both are great cars. I have a 2004 MACH1 and have studied, drove and own many Mustnags in my short time. It is a tough call and I am disappointed in Ford and the Dealerships because of the mark ups on things but I can also see where the Company is hurting for money and needs the extra cost if people will pay for it. I am always looking for a new Mustang but for some reason I can not let my MACH go. It is a tough call between these two cars but I still think I would take the Bullitt and have considered selling my MACH for one. The Shelby GT is nice. The fact that the car actually goes to the Shelby Headquarters in Las Vegas is a throw back to generations of Shelbys gone by. But the fact that car stickers for like ten grand over what the base Mustang GT is selling for is a big turn off. I know that I can buy most of the stuff from Ford Aftermarket and not even be close to that price tag. And to boot dealers are still marking up those cars which is stupid as in my area alone there are at least 4 2007 Shelby still sitting on dealers lots and it has been close to a year for some. Only one or two has actually still lowered there prices and it still does not make enough of a difference to buy one. Basically you are paying for a name and a heritage. Will the car gain in value over the years? Only time will tell. If you think about it the reason the older Shelbys are going for the price they are today is because there are so few left. But two model year runs with very little changes except for color on new Shelby GT's and the "larger" numbers produced in my opinion is not going to hold the value as well as the older Shelby's. Now the California Orange cars may have some slight advantage and if I could get my hands on one without paying a huge mark up I may consider that car and then it may be a draw for me on the two cars. As I think the production numbers will be very low on that Orange model. If you were to buy a Shelby I would go with a GT500 the numbers on certian optioned cars and combonations is worth it and I think these will hold there values better. An even better investment and drive I think is the 2003/2004 Cobra. (Read Iron Fist Lead Foot and you will know why I say this) The Bullitt though is worth the money it is what I consider a better car than the Shelby for performance, model and heritage and it is only a limited 1 year model production run. The 2001 one cars are still holding values pretty well if they are well kept. You get alot of exclusivity offered by Ford without the price tag.