i just bought an '02 z0 convertible (yes, convertible) and was thinking of my wheel/tire upgrade. i was looking at the c6 z0 wheels as well, but i think in keeping with the c5 theme, i'm going to go with the c5 z0 motorsports, chrome, in 18' and 19's. i've read a lot of posts on the subject, and one thing i read seems to make sense to me, there's a reason why our rides have a "raked" wheel setup (17/18's, 18/19's, etc.) so i want to keep that "engineered" thought intact. just my .02.
but i have also seen some nice examples of 18/18's and 19/19's as well.
bottom line...... your car, your cash, your choice. do what you think is going to look good TO YOU.
as for where, west coast corvettes (hope it's ok to mention them) has a couple nice wheel packages going right now, but i'll prolly just go to america's tire and have them match as close to the WCC pricing.
good luck and post up pix whichever way you go.
rich