I have AMEX Blue, you can get up to 5% cash back, no fees. A credit goes towards your January statement. I am usually in the $500-600 range but this year I am building a new house and I am already at $900.
For the first $6,500 of annual purchases, the rebate is 1% for Bonus Cash Back Purchases and 0.50% for all other Eligible Purchases; for Eligible Purchases of $6,500.01 or more, the rebate is 5% for Bonus Cash Back Purchases and 1.5% for all other Eligible Purchases. "Bonus Cash Back Purchases" are Eligible Purchases made at U.S. supermarkets, gas stations and drugstores, in each case that are not departments of superstores or warehouse clubs. "Eligible Purchases" are charges to your account for goods or services that have not been returned or otherwise credited to your account. Eligible Purchases do not include Finance Charges, fees, Cash Advances or other means of accessing your account, convenience checks, Balance Transfers, or the purchase of American Express® Travelers Cheques and American Express® Gift Cheques or other cash equivalents. Additional terms and conditions apply.