The carbon wheels are actually available in 5 different options. I'll break 'em down here:
8-spoke...........24mm/0 offset
12-spoke.........24mm/0 offset
dish.................24mm/0 offset
6-spoke...........25mm/0 offset
5-spoke...........25mm/2-deg. offset
I don't know if RC1 actually distributes all of the 5 versions of the wheel, but if they do I'm sure they are available from mdiracing in south florida.
I run the 8-spoke wheel on my RC Lab.