Most of them do a pretty nice job -- Gibson probably is the most traditional, Williams isn't far behind. Couric is a bit of a different "creature" in the anchor world, but she's still pretty smart.
The evening folks on the cable outlets aren't really anchors, they are more commentators.
Anderson Cooper. He's direct, to-the-point, funny, young-ish, can relate with guests, and overall just seems really nice. Also a lot of news anchors have got annoying voices but his doesn't bother me.