I need a new pair and am definately going for mitts after looking at this thread.
I've found another reason to have mitts is that gloves are so think you really dont have the advantage of the fingers anyway.
From searhing though ive found stores stock more gloves than mitts.
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I rock mittens with the glove liners because I always seem to forget to buckle something or zip something else and my hands are always cold so they keep me nice and warm even if I have to take the mitten shells off to fix something.