While I thank everyone for their thoughtful replies, most didn't address the question. I carry three liners and two sets of mid-layer gloves and mitts and I have a great system that works for me.
My question is about the insulated outer mitts.
Are the ones priced the same basically the same, or are there any real differences between them?
The problem is that they are expensive, and they can be very important, and if I buy the wrong ones, I'll discover just how important they are the hard way.
I've been using OR waterproof shells, which haven't always served me well, but I haven't been willing to pony up around $100 for insulated mitts, largely because I haven't felt knowledgeable enough to make an informed decision on which pair to buy, and with six winter backpacks coming up and then Denali afterwords, I finally have to act.
So thank you very much to all those who have posted, I do appreciate the sincerity with which people approach the questions that get posted. But if anyone can address my question about the mitts in question more directly (most likely because they own a pair), I would be happy to hear your thoughts!
Brian