You are correct....I did not type was I trying to actually say. You can get the coupe or vert in "Arctic White". However, you can only get a "White" Z06 from GM, if you buy the RFE....I pretty positive that you can get a factory white c6, the only z06 that was available in white was the ron fellows, but you can get a regular c6 in white no problem.
In sunny dry climes, in my experience, Silver and Pewter look better longer between washings than everything except maybe beige or tan. With any of these four, if you keep your windows clean, you could just dust for a couple of weeks - if so inclined.I think white is the second best color on the C6. All personal taste though.
Black by far is the hardest to keep clean and white is generally the easiest.