Las Vegas,

I'm currently in the process of planning a move to Qatar myself; while people who are already there may be able to give you more details, I would offer a couple of points for you to consider. For one thing, most of the US credit card companies add a 2-3% currency conversion fee on transactions made in foreign currencies. (I think Capital One is an exception and either doesn't assess such fees or has a much lower rate.) That can add up in a hurry. Another potential concern is that you may have trouble using the credit card (assuming you keep a US billing address) if you try to do online shopping from Qatar.

I believe that HSBC offers a credit card with no currency conversion charges in connection with its expat packages; I'm still looking into it, but that might be an option for you.

Hope this helps.