I have a C5 with the glass top and I like it because although your in a pretty closed in area it still has a nice open feel. The only downfall I have found is over the years the top starts to get a spider-web look to it (but the C6 tops may differ and not have this problem down the road, I'm not really sure).

 

I have a clear top and there is a shade you can put on the top it is perforated so you can see through it and it keeps the heat down and you can take it off in the winter . I wanted a solid top but the car came with a clear . I love it I'm glad I did not get the solid top http://www.zip-products.com/Corvette...A1D9D6FFEC7FBB

 

Just my 2 cents but. You'll have a hard time getting a color matching top after you buy the car. GM has the tops but they are not painted you'll have to have it matched to your car. You can buy the clear top after you buy the car if you wish there all the same So I'd get the color match top or both. I have both like the looks of the Yellow top best but the clear top is a better feel from inside. I't like having 3 cars if you have both or none at all on