I like the OR(Outdoor Research) mitt shells. I'd buy the gore tex mitts if you can. Make sure to get the model with the grippy rubbery palm and thumb. You can wear thick mitten fleece liners if it's cold out, or smaller mitten liners, or any thickness glove liner also. I've had mine for many years and they work great.
I just got mine Rome Index gloves, the warmest in their line. Not sure about durability since I've worn them once, walking the dog, this morning. I can say they are very warm, but not very dexterious. I'm sure they will pad out a bit since they are brand new and I've never had leather gloves before, but I don't expect much since these are supposed to be warm gloves and more insulation means less finger freedom. I love them and I'm pretty sure they'll be better than my Dakine gloves.
how are celteks? i'm tempted to get some -- they look and feel nice but they don't seem very durable or waterproof. i'm using leather burtons right now -- i like the durability and flexibilty of leather. plus if i ever get buried by an avalanche i can eat them.