I love my Ibex Kilo II gloves. I've got a bit of Raynaud's, so if it isn't going to get much above 40°F for the duration of a ride I may need something additional, but they're plenty for a ride that starts below freezing if it's sunny and will warm up within a couple of hours. They're comfortable up to 60°F or so since they breathe, though they might get a little sweaty.

Remember that a lot of keeping your extremities warm actually happens in your core. Sometimes an extra base layer is the best thing I can do to keep my fingers warm.