living in MI and fishing all winter, i tried them all and found the fleece fingerless worked best. i use these:
http://www.patagonia.com/us/product/patagonia-windproof-fingerless-gloves?p=34630-0-155
I'd keep an oversize pair of snowboarding mittens on my casting hand, from LL bean, and kept my reel hand in a pocket with a hand warmer in it.
FF and freezing temps just doesn't mix - its almost impossible to keep your hands dry even if your doing everything you can to not strip line, once you get the first fish, forget about warm hands the rest of the outing.
i'd go as long as you can without even using gloves, as you get used to the cold, but as you get older its tough to ignore.