I had an opportunity to sit in a Z8 a couple months ago, start it up, and otherwise soak up the car. I was intrigued! Now, if I had unlimited resources, I'd probably be hard pressed to buy a Z8 over say, a Ferrari 360 Modena. But a Modena to me should be a coupe. Somehow a convertible Ferrari seems compromised (after all, they are "chopped" versions of the coupe). It would be a tough call. But the Z8 could be a direct replacement for a Boxster, and I don't think I'd miss the Boxster one bit with a Z8 (not something I could say about the Modena coupe)
As a side note, I actually like the looks of the Ferrari 355 better than the 360. But with maintence being terrible with all Ferraris--but noticeably better with each generation, it makes sense to get the newest version.
So I guess my current dream cars would be a Z8 and a Ferrari 360 Modena...how about you?