I agree with Scott's analysis here. The wind is all or nothing here, so the 9m/15m Ion quiver makes more sense to me. If we had consistent 15 to 22, maybe I would consider a 12m Ion, but we don't get that kind of wind so often. The 12m might be a great kite for kite travel to DR, etc.

Besides, the 9m flat kites are so fast that you can ride them happily once it is blowing 20, and you can ride the 15m happily when it is blowing 20, so, in my view, the ideal quiver is the 9m and the 15m. Smooth out any rough edges with a board.