http://www.fulcrumwheels.com/jspfulc...e&enduro=false

http://www.mavic.com/road/products/k....996163.1.aspx

I've heard nothing but good things about the Ksyriums. I haven't used any, but I hear the Ksyrium is a very durable wheelset. They're also a hundred grams lighter, however the 3s have a deeper rim (4mm up front, 1mm in the back), but not by much.

Have you considered other wheels? Williams Cycling makes 30x, which are supposedly really robust and stiff.