Thanks for your clear answer!
For me the Kombat 96 with the freeride stock fin (31cm) and the 6.5m? Retro planes almost as early in lower winds as the C-121 with the 7.5m? while I don't like the feeling of the 7.5m? on the C-121 very much. Also the K-96 feels very stable and handles the chop better when I use a 5.5m? or smaller with the wave stock fin (25cm). I really like that board.
Funny that your target board quiver is more or less like mine!
Also for me my first concern is early planing because where I surf there are a lot of days with winds between 6 and 12 knots maximum.
After what Ian and you told me I will go for the IS 111/115 although I definitely prefer the D-Ram/Technora construction for reasons of price and durability. Maybe I can find a 2006 model.
Cheers to Ian and Pete