Of the boards you suggest, I would go with the 155 Futura. A better all around board that does lot's of things well. However, the Futura will not plane as quickly as the Go with a 9m sail. The iSonic is a race board and a little less user friendly.
The Formula Experience is a good light wind board, but it is designed for formula racing (mostly upwind and downwind sailing). At 90 kg and If you only sail in light winds, this may be your best answer if you are looking for maximum planing time. To really maximize the light wind capability of this board, you would need to go to a bigger rig (10, 11 or 12 m sail). Possibly more expense for another mast and boom.
Just my opinion.