Windsurfing is awesome, I really miss it. I started out on a 104L Tiga (1990) board (not sure of the length), and a 9m Gastra sail. I was about 70kg then and the 104 liters held me up fine. My friend, at 85kg sunk on it. Jibes were the hardest thing for me to get down. Make sure you get a harness because it's a godsend when your hands are trashed from doing a lot of waterstarts. A good fin/skeg is also a must in 20mph+ winds, or else you'll always be spinning out.

We used to take annual trips to the Columbia River Gorge at Hood River Oregon. I almost moved up there is was so crazily fun and addicting. There we would regularly use 4-5 meter sails (Neil Prydes). I once threw up my 9 meter sail, for kicks, in constant 25 mph winds and it was insanely hilarious.

About the only con to windsurfing is that you're alone on the water. That can be a big negative if you like hanging out and goofing off with friends on the cat in light winds.

Hope you're having a blast!