I sometimes prefer to wear gloves down to about 20 below when having to do work. The dexterity is greatly needed. For a few years, I've been wearing a set of Grandoe Gortex mountaineering gloves which have been decent. The only problem is that the insulation isn't removable. After working and building up perspiration in the gloves, it just seems to stay in them at a rate that isn't easily cast away by the gore-tex. Goretex isn't too breathable when the outside of your gloves are frozen. In fact, gore-tex fails in cold weather and there is no breathing of the material as ice crystals plug the pores of gore tex. I hate waking up to gloves that are like a block of ice.
I'm going back to elk leather gloves and mits with removable liners. At least then, you can bring mulitple types and sets of liners that you can take out to dry near the wood stove. If you can't remove the insulation, consider your gloves worthless.