RE: New board set
There are many possible choices, but the alternatives you present all seem fine. Both S-typ and Kombat are performance boards, but still easy riding. To find the sizes, I think you have to think about how easy sailing you want to have in light wind. 126 seems OK to me, but you could go both for bigger and smaller boards. For the smallest board, your wife has to decide. I think she will be the most at home on the Kombat 79. That just leave the size of the mid board which should work as a light winder for your wife and a high winder for you. A kombat ia a nice choice because its very versatile. As for sizing, I think both the 97 and 107 will work for your wife since she will be able to go for the 79 as soon as it gets windy/choppy. If the Carve 90 has worked OK as the mid board for you now, then I think the 97 will be best. It will still handle reasonably big sails and get going early but also handle rougher conditions better than the 107.