The Flylow Colt Down jacket is the shit for really cold resort days. I wear mine for the -30C days we get here in the Rockies and only have to wear one base layer underneath. It also has great venting if you need to cool down quickly.
My Virtika jacket is super warm and stylish, it features removable sleeves so that it can transform into a vest for early spring riding and it comes loaded with tons of features that just aren't matched by any other brand. Also the durability of this coat is out of this world!!!!