For 14-16 knots a 7.5 m2 free race sail (Sailworks Retro, Severne NCX,etc) should be good for your weight.
17-21 knots 6.0-6.5 m2 rigs should work nicely.
Be sure to get the lightest, highest carbon mast you can afford that is compatible (recommeded as
the "best mast" for what ever brand of sail you choose). One mast should cover both of these sizes.
One sail will not be enough for this range of windspeeds.
Hope this helps,