Well ... it seems that I have to choose what suits me best between the F101 for 4,5 to 6,5 and the F111 for 5,5 to 7,5.
If I can have a cheap wave board for my 4,5 I think my best option is to go for the F111.
Other question : let's say that I take the 111, what would be "ideal" for lighter winds with my bodyweight ?
I only need something for winds greater than 12-15 kts which is already a nice target with my weight !
Many thanks for your help, I start to get the picture.