I like the Amex Everyday Preferred card. A lot of credit cards out there have dining and travel as bonus categories. Amex Everyday Preferred has groceries and gas as bonus categories, so it complements nicely as an additional card. If you charge 30x or more in a month, you get 4.5 Amex MR points per dollar spend on groceries, 3 points on Gas and 1.5 point on anything else. Note that this card does have foreign transaction fee.