Originally Posted by Unregistered
My weight is 76-78 kg...
I am 70Kg and I wondered between the Is76 and the Is86 for a while when I was looking for a replacement of my Sonic W52. I saw the Is86 and it was too big and the Is76, on paper, has the same dimension in the tail with just a slightly narrower max width. I am sure it works great especially for bigger/heavier sailors but I ended up buying something else, a Carbon Art Slalom 52 that at my weight and size (173cm) is right on at 5.5-6.3. For your weight you might want to consider the CA SL 55 (one size up from mine, similar dimensions to the Is76 but with narrower tail and more volume) that is more all around then the 52. You can get some info on the CA on their web page an doing a search at the Maui Sails forum.
So anyway, for your weight I would go Is76, or CA 52/55.