I've seen this same thread at least ten times... and posted in several of them. Hate to say it, but I fear this might get locked in favor of and older thread.
Regardless, all of you disappoint me. Your selection of car choices is nice, but you've missed some good ones.
Lamborghini Reventon.
DeTomaso Pantera
Vector M12
Vector M12 LM
Vector W8 Twin Turbo
Italdesign Nazca C2 (NFS3 FTW)
Pontiac Firebird, GTO, Solstice, Sunfire.
Premium Mitsubishi Eclipce, GTO/3000 GT, FTO.
Premium Toyota Supra. (newer years)
Plymouth Superbird.
I'd love to see more premium Lotus and TVRs, (Speed 12) but I think that's just me.