RE: Right choice ? GO or Carve? From 120 to 170?
At your weight it is really up to how big sails you are going to use. If you are not going to go above 8.5 m2 then the Carve 133 would be the best bet.
It has sufficient float for you, and will still be manageable in somewhat stronger winds as well. I do think it will be more versatile. In light, non-planning winds, there is really no difference between the Carve and the Go.