viper and GT are definately at the top of the list for me. i could have bought pretty much anything i wanted and i bought them so i think that says alot. now if the shelby GR-1 was put into production i would buy that and add it to my list.
I have a few and they tie eachother...87-93 Mustang, 84-88 Chevy Monte Carlo SS, 1957 Chevy Bel Air, 1967 Chevelle, 1969 Camaro, 1992 GMC Typhoon, 1987 Buick Grand National, 2003-2004 Cobra.
Probably the car I want the most is a TVR Sagaris. But all time favorites would have to be the XJ220 (which is the most beautiful car I've ever seen in person), the GT, and S7TT.