Look for a Severne Glide!
I have the '07 7.5 m2 and it's pretty awesome, especially on the Serenity (similar to railing upwind on a long board).
It can be tuned to be full at the top, or floppy (just add downhaul).
I've used the same sail on the Apollo and managed to use the added low end power to get the Apollo going really early for a 7.5 m2.
They are making a 8.5 m2 for 2008.
Hope this helps,