Thanks for that indeed. I will put the quad 71 at the top of the wishlist. The performance with the 5.2 sail or in gusty conditions will decide if I need the evo 75 still. Would love the kudos of a 66 board [much like the 69!] but i suspect I would get more value with the 71.
It would be a feat to cover all options with only 2 boards. But the prospect does appeal - especially if the quad delivers in the cross-on as you say.