There's a good read in this NYTimes article about the true cost of rewards cards:

http://www.nytimes.com/2010/01/09/your-money/credit-and-debit-cards/09money.html

And they link to this neat calculator that tells you how much more merchants pay based on you using a particular card with them:

http://truecostofcredit.com/calculators/tax_calculator_reports/new

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If you only want to use one card, I think the best two options are:

1. PenFed Visa Platinum Cashback Rewards card. It's rewards are 1.25% on everything, 5% on gas, and 2% on groceries, and the rewards are credited to your account every statement. You can become a PenFed member by joining the NMFA and opening a savings account with $5, pretty easy all told.

2. Schwab Invest First Visa card which is 2% on everything (or the Fidelity Visa at 1.5%, or Fidelity Amex also at 2%). This is the best 'everything else' card rate, although you can do better on specialized categories if you're willing to separate your spending. They all require that you reach a certain number of points in order to cash in.

Also worthwhile:

Amazon Visa: 3% on all Amazon purchases, 2% on gas / restaurants / drugstores, 1% on everything else. Worthwhile for the Amazon and restaurants portion to me. Rewards are Amazon gift certificates at 2500 points or cash at 5000 points.

Worthless cards:

Chase Freedom - formerly a great rewards card, the new rewards scheme is complete crap and I haven't used mine a single time since they completely screwed me by changing the scheme with no notice literally right before I was about to cash in (after around 1.5 years of accrual). Typical Chase.

Discover - their Open Road card was formerly a great gas card, but the monthly cap makes it useless. The level to redeem rewards continues to rise, the benefits continue to change in stupid ways, and I particularly dislike their use of the 2 cycle interest calculation method. You can conceivably get some decent cash back if you purchase the right things in the right month, but that's more work than I'm willing to put into it.

Amex Blue Cash - often referred to in the past as the best rewards card because it can go up to 5% (groceries / drugstores / gas) and 1.25% on everything else. You only hit those numbers after spending $6000 and the reward is only dispensed once a year. I don't think it's worth it given the rates you can receive from day one on other cards.

Citi ThankYou rewards cards - Citi had a few reasonable rewards cards, but they have continually increased the number of points required to receive cash or cash equivalent items from their store. The cards advertised as 5 points per dollar wind up very far from 5% back. Their non-ThankYou cards are fairly lame as well.

Any card with a 1% cashback rate - 1% should be considered the bare minimum rate, since there are a million cards out there that offer it. You can pretty easily do better.

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