Yeah it'll be best bang for the buck new, but still not far off from a ZR1.
I have been looking and can get a used GTR for 65Gs here with a couple thousand miles, comparing it to the other cars I listed it is still more expensive than them. The 996 911 Turbo would be around 45Gs, ZO6 50Gs, Lotus Espirit V8 40Gs, killer deal on a 2011 GT500 at 47Gs with 900 miles on her, E55 around 32Gs unless I sacrifice mileage then around 25Gs, E60 M5 high 30s to mid 40Gs, and C63 55Gs. Of course I am not ready yet, it'll be a couple years *hopefully* but I am keeping my eyes on the used market.
how old are those cars you listed ? what year? cause those prices are very reasonable for the car you mentioned.