Demoing a 9m on sunday! (if the wind pulls through)
At the moment, judging from all the comments: 9m and 12m seems the way to go.
All though the idea of a 7m and a 10m + a North Nugget board sounds good too for the main reason that I have an excuse to also buy an extra board

but also because of the small, agile 7m which would probably be a hell of a lot of fun.
I just wonder if there really would be enough days in summer to take out a 7m with my weight.
there will probably be more light wind days (12m) than 25knot+ days for the 7m