I use a Hoya and I have no complaints. It get great results with it. I would recommend a multi coated one, I have no proof but it seems that I have less lens flare and it cuts glare a little better than one that is not. You might think about a Cokin grad system. In my opinion you get better results. A polarizer can cause loss of color in the foreground. A Cokin graduate only effects the area you wish it to. You can adjust the filter up or down and it brings out as much detail in the sky as a polarizer.