I just copped a pair of Dakine Titan Mitts and they are the BEES KNEES!!! I have the shittiest circulation in America and even these mitts kept my hands nice and toasty in pretty cold conditions. They are Gore-Tex (can't get more waterproof than that) and at $65.00, they are probably the most affordable for what they do.
I can vouch for the Titan Mits. I am always looking to upgrade stuff and just can't justify the purchase of another mitten. These puppies are great.
Just got the Dakine Titan Mitts and absolutely love them. Have all the things you'd want. leash, over cuff etc. Only con is the palm rubbertec freezing slightly on a long cold day but it doesn't really impede movement.