It is literally impossible to make a honest ranking - firstly no one has compared all the 2013 boards (bolded on IKA list) using same fins and same kites.
Secondly - all top riders are biased, they prefer one or another style of riding or feeling of the board.
My personal experience is that the board needs to be forgiving enough to let you finish the course without crashing. A fraction of knot in top speed doesn't count if you crash or have difficulties riding in the right position.
Another important point is - you need to trust your gear so there will be no excuses from giving 100% of what you can give.
From what I see at the Africans right now - all the other characterics are not that important. The top guys would be still top on any 2013 board.
My personal choice is N+1's FOKA http://nplus1.pl/products/8-foka-13.html
for it's huge rocker (no crashing on downwinds) and construction that guarantees durability.
But remember - I am also biased.