Taxi Ezeiza is pretty convenient and you can book online, then they'll put your name on a big sign at the taxi stand and you will not have to wait until they have a free driver. I don't think they take cards, but USD/EUR they definitely do.
There are three or four Citibank ATMs at the arrivals hall but those occasionally are out of cash, in that case walk right and then another right and use the Banco Nación ATM.