itīs a tough question. On the one hand the 107 will cover an extremely wide wind- and sailrange. Would recommend to choose the Carbon Version. On the other hand you need a board, which allows you to plan in lightest conditions at your homespots. SO I would suggest to go for the 117. This board has an excellent upwind performance. You can use a 42 or 44 cm fin combined with your 8,5 and you will have a lot of fun in 10 knots. The 6,9 works fine, just needs a shorter fin around 40 to 42. You have the option to put a bigger sail on the 117 and sail the board with a 46 cm fin.
Hope this helps,
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