i107 or i117

After some advice on which board would be best for using with a North Warp 8.6 and Koncept 7.5 as a light to medium wind board. I have a 59cm wide board for 5.8 and 6.6 sails but am undecided on the next size up. Will the i107 carry the 8.6 comfortably or would the slightly wider i117 be a better bet for light winds or will it only get me going 1 or 2 knots earlier than the 107?

I weigh 73 kilos.

Hay