Being from the US aren't there thousands of Mustang's available? Surely it would need to be a special edition to stand any chance of appreciating, at least for the foreseeable future? It'd be like expecting a 2010 Golf GTI to be worth a lot of money?
The 350gt is the Shelby special edition, has the voodoo engine with the flat plane crank and 8k rev limit. Should hold it's value as they are unlikely to use that engine again