In the market for a rewards card? Here's a list of the best out there. Of course, "best" is a relative term, so evaluate a card based on your needs. And if you're curious about cards that earn frequent-flier miles, points toward gift cards, goodies and even money for college, visit one of the card comparison sites listed below. Cash-back cards

Do you value flexibility? No need to worry about redeeming points or finding flights with cash rewards.

AmEx Blue Cash: 5 percent cash back at supermarkets, gas stations and drugstores; 1.5 percent elsewhere. You have to spend $6,500 a year to receive the top-tier rewards, otherwise it's 1 percent and 0.5 percent.

Chase Freedom: 3 percent for every dollar you spend in three categories where you spend the most; 1 percent everywhere else. You can only earn 3 percent on $600 in purchases monthly, so be sure Chase's categories mirror your spending habits.

Discover More: 5 percent cash back in rotating spending categories up to $400 per quarter; 0.25 to 1 percent on all else.

Gas-rewards cards

If you're loyal to a certain gas station, many companies offer 5 percent cash back on fuel at their stores. Otherwise, consider the following:

Discover Open Road: 5 percent cash back on gas and auto maintenance purchases up to $100 a month; as much as 1 percent on other transactions.

Chase PerfectCard MasterCard: 6 percent cash back on gas for 90 days; 3 percent on gas after 90 days; 1 percent cash on other purchases.

Costco TruEarnings: No annual fee for Costco members. You'll earn 3 percent back on gas and restaurants, 2 percent on travel and 1 percent for everywhere else. Rewards are redeemed annually at Costco or for cash.

Card Comparison sites

www.cardratings.com

www.credit.com

www.creditcards.com

www.indexcreditcards.com

www.lowcards.com

Sources: Bankrate.com, Consumer Reports, Credit.com, Cardratings.com, Star Tribune