Thinsulate-lined deerhide work gloves is about all I ever need.
I got a pack of 3 pairs at Costco a few years back, for like $20 or something. Doesn't take long to take the right one off when it comes time to pull the trigger. They are great for handling ice-cold tire chains when the time comes, too.
More often than not, the gloves are in my pack. My hands have to be really frickin' cold for it to bother me. Like a couple weeks ago when it was 1C and pouring rain, and I was riding my dual sport with soaking wet gloves at 100 km/h. Actually my entire body was wet. About 3 inches of water inside my insulated rubber boots, too. That was unpleasant.
In severe cold, I agree that thin wool gloves inside some good mitts is the way to go.