Um well, you're looking to change your DAILY DRIVER. Certainly an S2000 is no less DD-worthy than an NSX (more so), but do you really want a Z06 as a DD??? What is your weekend car???
I guess, to me, a DD should have some semblance of comfort and driveability - can't imagine a C5 Z06 would have those. Maybe if the suspension is adjustible with a "pussy" mode it would be ok, but otherwise... It's like getting an F430 vs. an F40. One is definitely NOT a daily driver.
For the same amount, I'd look at M3 or S4. Great performance, lots of creature comforts, not too much more mechanical problems than a Chevy :wink: , and still more attention getting than your S2000.