I have the 2011 and use a Talon 48cm G10. It's best with Reflex 7.8 and a little under finned with my CR8.8m - but manageable. I'm 82kgs. Many people suggest that carbon is better for longer fins but they cost more. If going for one fin I'd say 50. If two 52, 48 would be a good combo.
BTW I've also used a 44 Canefire with a 7m on a really gusty day, that worked well too.
iS 94, iS111, iS127, F161, Mistral Equipe