I'm trying to decide what next to purchase, a circular polarizer or graduated neutral density. I shoot outdoor scenery/landscapes/nature most often. I know that filters can cost quite a bit for quality ones so I'm only looking to buy one right now. I will definitely own both in the future. I like the ND because I hate blowing the sky out in my landscapes. I also love clouds that pop out. I'm not EXACTLY sure if the polarizer is much different. I know what it does and how it works but it looks like it functions the same: it brings out the sky and increases contrast between the clouds and sky. It also reduces glare if I'm shooting the ocean (which I do often). Help me decide or even throw me a different suggestion. Thanks.