Shimano XTR M970 Cassette 11-34t
Want the best 9 speed cassette you can get? The Shimano M970 11-34t cassette is light, 9 speed and XTR sexy. That's right I said 9 speed XTR. Get 'em while supplies last.
So light it's eerie. I'll have to ride it a few more years before I can comment on durability, but so far so good.