Plan on doing a LOT of shopping
Seriously, I don't know the answer, but I wouldn't get a new credit card just to shop overseas. I typically use either Visa or Amex and I have never seen any outrageous service charges on either one.
You could run up your AMEX and then refuse to pay it off - then they should offer you $300 just to close your account. That seems like a pretty good deal to me.