Southwest Rapid Rewards Card
If you do most of your traveling within the U.S. this is definitely a card to look into. You get 2 points for every $1 you spend on Southwest flights and rapid rewards hotels and car rentals. You get 1 point for every $1 spent on everything else. This comes out to a 1.5% to 3% rewards rate and you get a 40,000 point signup bonus and a 6,000 point bonus annually.