There is one more kite alternative just to totally confuse the issue

The new "hybrid" style kites - "C" style kites with much improved wind range and massive depower - e.g.
F-One Impact & Tribal
Wipika Matrix and Indy
Ocean Rodeo Diablo
North Vegas
I tend to agree with the commentary preceding about changing boards rather than kites and that a one kite quiver is a dream. (Although I have seen a guy use an old Arc in anything from 10 knots thru 30+ knots...mind you he was a damn good kiter).
Had to laugh about Caelahs light wind board.....I have the same thing as my high-wind board...but weigh in at least 20 kilos heavier.