As a spiritual successor, I'm gonna vote for the Abarth 500 Essesse, it's the closest I've found to a G40. Lightweight, forced induction and they love being thrown around. Plus they look gorgeous!
Personally though, if I smashed up the G40 I'd probably sell the Passat and use the cash from both to buy an S2000. I've been lucky enough to try it on road and track, and it's absolutely brilliant!