Roger, thanks for your quick reply and advice. I think the board in question is a later version Rio, but I will verify..
Also, if I was going to start w/ just one sail, what size you recommend? If I was going to go w/ two sails, which sizes. Again, I'm 155lbs. Largest I have used so far is 5.0 on rental boards in light/moderate conditions.
Thanks, and on a separate note, this forum is great reading for somebody just getting into the sport and trying to soak up as much information as possible!