Kotaman
WKR
If you are sitting in a stand and need dexterity, the light glove/muff/hand warmer combo cannot be beat. If you want a really warm mitten, I've owned a few and the Marmot 8000 Meter takes the cake, but they are expensive. I have some Mountain Hardware mitts that are a close second. I don't mind the KUIU mitts for something portable to take in the pack, but like to use them with a wool liner as I don't care for a nylon lined mitten by itself. I bought the First Lite Grizz mitts this year and didn't care for the, especially for the price. Good old Chopper Mitts with a wool liner are also a great way to go, but not as warm as many of the down offerings.