I'm about your weight and used to sail a Sonic95. Was confronted with your same decision as I sail in the same (+/-) 15 to 25 knots winds. During the first season, I used Maui Sails TR-2 6.6 and 7.6. I discovered that 1) actually, most times I was on 7.6 at my spot, once the wind built up I ended up going to shore and switching down to 6.6 because conditions were just perfect for that, and 2) the Sonic95 could easily carry the 7.6 but was not competitive in its proper conditions. Ended with purchasing 6.3 and 7.0 in '07 (TR-3), and again in '08 (guess which sails...).
My decision was heavily based on 1) the fact that usually at my spot if it's windy, it's windy, and 2) I prefer to have a perfect setup for really good days than to have a perfect one for the days I'd better do something else than windsurfing. That said, and assuming the 94 has range and performance similar to those of the Sonic95, I'd go for the iS94, 6.3 and 7.0. IF you are thinking about competitions instead of just having fun, I guess the iS101 (or even 111) is the choice (with 6.6 and 7.6).
Last edited by geo; 23rd May 2008 at 02:26 AM.