I really like Lion Brand's Landscapes. It's a wool blend knit on Size 13 needles, and they have some very pretty colorways like River Crossing, Campfire, Coral Reef, Rose Garden, and Summer Fields.
Last year I used it to knit a cabled neck tube. I really liked the way it turned out, but I never wore it. So this winter I went back and picked up stitches along the "top" of it and turned it into a hat. I love the colors in it (River Crossing) and the hat is super warm. I'm not normally a big hat person, but I wear this one whenever I get a chance!