Supecharged or supercharged...?
I jest, I'll play properly now. I wouldn't buy an Ultima, as you'll likely grow hateful of it in anything other than perfect weather on track. I wouldn't buy the A45 as it's just a tarted up A class (sorry Colin!). GT-R I can see the attraction if you like them, so maybe one of those although I suspect it'll get pricey to run. SC'd E92 is probably my pick out of those, however I suspect it'll feel very bland coming after the VX. But then, most things will I guess.
C63 not an option? The older one with the actual 6.3, one of the finest engines ever made and likely never to be seen again? Or a Maser GT, that high-revving V8 is absolutely gorgeous and it's a proper stunning car to look at too.