If you are going to race a 9.5 is a good start and cams a must.
Below are a few links that may help.
Have a look at the article on
Raceboarding & light wind, it has some links to the latest raceboard sails. Russell's sail in the pictures is a custom made one by Barracouta Sails here in Sydney, a few of us have them (9.5).
From the article.
The Aerotech sail in one that's used in Exocet's Warp-X promo shots.
You might want to also check out this rigging info:
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Shape & rigging-
Adjustable downhaulsFor abit of background info on sail sizes
read this discussion.
What's you weight? are you planning to race?