I haven't looked at test driving a Z for the simple reason; I can see myself 'JUST going in for a test drive' to 'Check out the new Z guys' LOL.
Right now; I'm really leaning toward just keeping my G (having a backseat can be nice even though it's ONLY for show) but I definitely see myself in a Z within the next 2-3 years. It's one of those things where you know what the right answer is but you just don't want to listen to reason.
To me, the Z is 'sex on wheels' and just has that look that is so nice (pretty much what i thought of the G when i first saw it back in 03). Just nothing like it in it's price range; even the new G37 doesn't do anything for me. Part of me thinks the ONLY thing I would miss about my G if I would trade it in would be the moon roof but I'm sure the trade off would be worth it.