Don't make the mistake I did and try and upgrade sails and boards separately. Modern short boards need modern sails to make them work.
I like to have one board that will float me comfortably so that I can sail in variable winds or launch from sheltered sites. I am 5kg lighter than you and have a 80cm wide 150 litre board which I use 80% of the time with a 8.7 m2 sail, its faster than my smaller board until about 20 knots. I would go bigger than the Futura 133 (maybe the 144), I had a Carve 131 and it was a sinker for me.
Have fun with your new gear.