I used to love the old Blue Cash card. It was kind of a pain to have to keep track of progress toward that $6500 threshold though (because you didn't really want to be putting your potentially-more-valuable grocery and gas spending on the card until you got to the 5% cash back after meeting the $6500 annual spending threshold).

Nowadays I've got a set of cards that pays me 5%+ rewards on my groceries and gas (and some other categories) from the first dollar (rather than only after spending $6500 on a card in a year). To figure out which combinations of cards could be good for your expenses, there's a reward calculator at CreditCardTuneUp. com.