I put michelin PS2s on mine.....same wheel size as you want to do. 265/30/19 and 295/25/20
Goto "My Corvette Photos" under my name and see what they cosmetically look like.
On my other wheel combo, which was the same size wheels, I had Continental Sport Contact 2s....I think they now have Sport Contact 3s...
The front were 275/30/19 and the rear were 305/25/20
We have PM'ed before on one of the the Z06 sites...I had the pics of the silver Z06 on the sheet of iceartyon: