I ride Airush Sectors as my main LW/Med wind boards. I'm 92Kg and ride the 54 V3. Last season I rode the 52 V2. In previous years I have rode the 60 Sector V1-V2. I would say at your weight, the 66 would not be the best choice. It is a very wide board but super quick to plane for a bigger guy. The 60-54 would be what you need to decide between. I went to the smaller version for more manoeuvrability, better jumping and just way more fun! The V3 is much quicker rail to rail than the V2. The Tri fin set up is not as good upwind as the quad but the V3 is faster.
Here is a little clip of me riding the 54 V2 in 9-13 Knots with a 2013 SS Rally 14m. My buddy I'm catching in the one scene is on a V3 66 with a SS RPM 12m. He is about your weight.
If you are ever thinking about a bigger kite, I have ridden the 52 V2 on a 17m SS Turbine and it was like stealing wind at -8-10 knots.https://www.youtube.com/watch?v=kY9Yu0gcYAs
We have Sector 60's in stock but the shipping might be cost prohibitive. Have a look and if you have any other questions,please ask.http://www.silentsports.com/store/