Mr Mustang,
I would add some low production unmolested Saleen Mustangs to the Cobra mix.  There were some nice fox body cars made in the late eighties and early nineties. The S-351 cars during the sn-95 body style have very good potential...very low production numbers with lots of power.
The Saleen S-7 twin turbo is also a favorite of mine...for the supercar group  Too bad the race car version wasn't very succesful at Le Mans.
I think Jay Leno said it best. Buy a car because you really like it and enjoy it rather than speculate it's future collectiblity.