Hi Ant,
At 65kg I am thoroughly enjoying my 11, 7m C4 combo. I get out on the 11m in 12 knots, not boosting huge or anything, but I can do low level freestyle and when combined with my Decay Scimitar I can have heaps of strapless fun. Ideally I'd love to add a 17m Zephyr for the 8 to 14 knot days, then hop onto the 11m C4. I can comfortably hold the 11 into the 20's and the 7m is usable for me from 18knots, so heaps of cross over.
I haven't been blown off the 7m C4 yet, so I reckon as a high wind kite you'll love it! It turns amazingly, boosts well, relaunches great and has depower like no other 'C' kite I have ever flown! Double kite loops are very do-able and the nice thing with the C4 is that you can steer it so accurately that you can start with little helicopter kiteloops above your head and then work your way around to seeing your kite lower than you mid yank !
I had a go on the new 11m Edge in 12 knots last weekend and man that kite can boost even in such little wind! It pulls awesomely all the way across the sky and I can see why Adam Koch came first in the North American Course Racing Championships using the 2010 Edge!
Good luck with finding your ideal kite quiver!
Su Kay