My MTB came with similar wheels, WTB Speeddisks/WTB hubs and yea they re heavy. While I prefer ordering up something 'custom' I got a good deal on the Easton XC-One wheelset and put those Alligator TiN coated rotors on it. Works well.

Next time, I am putting together a set of these: http://www.bicyclewheelwarehouse.com...&productId=155. They've been getting good reviews on another MTB website; I plan to use the Supercomp spokes, Pure XCR hubs and use my Alligator rotors as they work well and are light.