Sun/ringle disk o flea 1400g for the set....I just put a rear on my bike, have a straight pull 975 XTR that is wicked light on the front......
the disk o flea replaced the same rear you have (and it has a wicked click sound from the hub)

oh and go with the 2pc XTR disks.....much lighter
see sig picture for XTR front/disk)

oh oh, and go tubeless.
then we can talk cranks