I like Diehard. I put two 900 cca suv silvers in a couple years ago, love them. I had ACDelcos for years, but after I replaced one I started having a bunch of problems. In my experience I've tried to save money with cheap batteries, had problems and eventually got fed up and ended up going out and getting the biggest Diehard that would fit. I used Diehard Golds for years with great success, I forget why I got Silvers last time, but there must have been a reason.
Just my opinion, I know everyone else likes Interstates, and their fine. A lot of people like Optimas but I don't trust them, I've heard of too manmy problems. I was told by a tech that because of their dry cell design they take a little longer to kill, but they won't come back from it as well or as many times if you kill it by leaving lights on or something.