If you are buying health coverage in the Colorado ski resort towns, the Connecticut suburbs of New York City or a bunch of otherwise low-cost rural regions of Georgia, Mississippi and Nevada, you have the misfortune of living in the most expensive insurance marketplaces under the new health law. The 10 most expensive regions also include all of Alaska and Vermont and large parts of Wisconsin and Wyoming. The ranking is based on the lowest-price "silver" plan, which is the that the majority of consumers are choosing. These regions, created as part of the health law, range in size from a state to a single county.