Hmm, didn't think about the GT-R. I was thinking more Altima. Haven't had a chance to race one yet, but my money's on the GT-R ending up on that first list.
I should mention that the cars on both those lists are not what you would call "bench racing" scenarios.
I like the cut of your jib, sir.
I would like to add that I have raced my friend's GT-R, and it wasn't even a race. It felt like I was parked and he was driving away from me, it was so hard of a smackdown. That car is liquid fast. Yes, even from a dig.
I have the same top list you do (man, do I want a CTS-V if I ever need a sedan) from the same types of experiences.
I'd like to add the following to cars that the 5.0 will repeatedly kill on a street race:
03-04 Cobra with < 450hp
Plymouth___ (haven't run across a racing Prowler yet)
And I'd also like to add the following cars to the top list:
68 Nova with 454
Lamborghini Gallardo (not by a lot!)
Ferrari 360 Modena (I'm not even sure it was there, it disappeared so quick)
Ferrari 458 Italia (definitely saw it leave)
Porsche Panamera Turbo (ugly but F A S T!)