amex-costo true earnings card may be the best for you.
4% back on gas
3% for restaurants
2% air and hotels
1% for everything else.

cashback is in the form of an annual check.

In addition to the above, you also get immediate rebates on some purchases through the open savings network. for instance your springhill check out folio will have the full price. your credit card statement will show the full price, and a seperate line item will list the cash rebate amount.
JetBlue, 3%
Hertz, 5%
Hyatt Hotels and Resorts 3%
Marriott(springhill, residence inn, fairfield, courtyard, and townplace) 5%