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If you: think cash is king
Card: Fidelity Investment Rewards American Express Rate: 13.99%
You earn: Two percent cash back on every single thing you buy -- no tiers, no caps.
Caveat: You must have a Fidelity brokerage account, but there's no charge to open or maintain it.1
NEXT: 51. Best reward cards
Last updated May 12 2010: 10:39 AM ET
1Minimum initial deposit of $2,500 required. 2Point valuations vary. One example: 30,000 points can earn a $400 roundtrip plane ticket. Go to penfed.org for more info. 3Via membership in the National Military Family Association. Government or military employees or family join free.