I have a Promotion 5/3 from the Gorge USA and its made specifically for windsurfing with slighlty oversize arms and really stretchy material for less "arm pump" .
It's by far the best suit I have ever had for windsurfing the last suit I had was an ONeil 4/3 which had stiffer material and this one has velcro ankle seal/straps that make it easy to get in and out of and stops the water flush. I know its good to shop locally but to save $200 and have something superior delivered in a week it's worth it.
The crew reckon I'm a bit soft, I also have a Hotsuits wetsuit heater and thats awesome for those really cold days.