Crossfire SRT6s came in 4 colors: Black, Gray, SSB, and Aero Blue.
If DCX's only comment on production figures still holds true - 2,016 SRT6 coupes and 928 SRT6 roadsters - then I've got a sampling of almost 15% of total production (see thread 'SRT6 Serial Numbers').
So far, the colors and production go like this:
Highest produced
Black
Aero Blue
Gray
SSB
Lowest Produced