I'm a Costco member myself, and I did the Mexican Beer thing too. They have really good meat at Costco too! They recently started offering prime beef in addition to the choice meat they currently offer. They have excellent king crab legs too......Love that place.
As far as beer goes, I'm one of those guys that like bud light and Corona, which would be considered grade B beer. I'm more of a light beer fan, less after taste, hate the beer after taste. Can't stand scotch, more of a bourbon guy. But you need to have a good wine that has breathed for a while and you might change your mind!