I didn't read the thread, so sorry if this's been said.

But for me, the G was almost half the insurance cost of the Z. Kind of huge, in my opinion.

 

WOOW my friend says the exact same thing.
He said my car worth the money, but the Z doesn't !

 

Here's what I do every time I'm thinking of getting a Z... I go down to the local dealership (only one in the city) and I take a Z out for a test ride (at least an hour). It's fun, it's fast and the Z feels great. So, this is the trick... after the joyride, I get back in my G and after driving a few minutes I think: "man this G feels so much better than the Z". I do this every couple of months and it keeps my brain in check.