I just last night picked up a pair of bright orange hunting gloves from the local department store (Meijers) for $8.99. They're waterproof and toasty warm, wore them this morning on a 17*F ride in and my fingers were toasty the whole time.

They're so far the warmest gloves I have, and some of the less warm gloves I wore 2 years ago on a -25*F day. That wasn't very comfortable, but I didn't get frostbite.

I think there's a hell of a lot of variation in how much insulation people's fingers require. I know people who would wear heavier gloves at 30*F than I do at -20*F.