I'm surprised a rider with a spec like this would be sporting the good ole Mavic D521s! Any reason why? I've heard they're strong, I'm infact rolling with them myself but obviously havn't tested them to there full...
Haha nice, I woulda chosen the new ones purely because I love the look of them! I was after a set of the new ones myself, but I had the option of two of them, or one of the new ones... That's an obvious answer...
Same rim, it's just color... not a big deal. I put 721's on the new build. Here's a shot of the "almost done" bike: http://www.pinkbike.com/photo/3170339/