The folks over at the New York Times have put out a great article on picking the right credit card for traveling overseas. The majority of US based credit cards add a foreign transaction fee when it is used anywhere except the US. The article strictly focuses on the cost of transaction fees. While they don’t mention anything about service, purchase protection, or insurance it’s still a great read to help make a decision on what card to use.
As always remember to call your card company prior to traveling to let them know where you are headed. This will alleviate any denials when traveling.