What is the best rewards credit card for getting the cash back?

I have excellend credit and I love the cash back rewards of credit cards. Right now I have a discover and get 5% cash back on gax, and 1% on everthing else. Does anyone know of any better credit cards for cash back?

The best one is Chase Cash Plus. 5% cash back at grocery stores, gas stations and drug stores and 1% cash back on all other. Here is the link
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The BlueCash from American Express is one of the best rewarding credit cards out there. It gives you up to 5% cash back and 0% interest for 6 months! To learn more or apply: http://www.creditcardatoz.com/american-e…