80%. Carbon mast min, that's a must, the rest doesn't matter much so long a it's balanced.
What's your board size and sail preference? Ezzy is super stable and dependable, can be too powerful depending on your spot. Great for bump and jump and side on.
Neil pryde have always a nice feeling even their weird 3 batten dafly.
Goya more hit and miss. Just ask me if you'd like, check out some old but interesting board tests:
windsurfing.lepicture.com/