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.