Thanks, I looked into the Blue Cash and BC preferred. I'm actually liking the 6% cash back at supermarkets since the bulk of my expenses are at supermarkets and gas stations. I crunched some numbers using the spending trends from my discover, and, between the 6% for markets and 3% for gas, I would rack up approximately $550/ year cash back in those two categories alone... not bad at all. And I can use it at Costco!
Glad to help, just to remind you that big box stores (Target, Walmart, Costco and etc) are not considered 6% stores, however, it's good for Ralphs, Vons, Whole Foods, Trader Joe's and Sprouts.
Also, you can buy gift cards at those stores, including gas cards, turning gas into 6% cashback.