So, the AMEX PRG, Barclay's USAir, and Chase SW. I was looking into a 4th card option, and I'm thinking about the AMEX Hilton (no fee card). I know the Surpass has a bigger bonus, but there's no annual fee waiver for the first year and, while I want to start building hotel rewards too, I don't see myself using that card enough to make it worth getting the Surpass, and the 40K hilton points after $750 in spending seems like a decent bonus.

Any other input for a possible 4th card, or should I just stick with the 3?