This is a 'curiosity' question. My wife and I are hoping that in 1-2 years we can take a nice week long trip (on our own) to France before we have a second child. That being said, with the exchange rate as dismal as it is and money not being terribly plentiful we might change our minds and go to either the south west for 8- 10 days (Grand Canyon, Arches and Canyon lands, Bryce, Zion) or possibly go to California (San Francisco, Muir Woods, Yosemite). So that being said, especially for the South West to capture some big sky sun sets/sun rises what would be my best bet for graduated neutral density filters. I have none at the moment and I have never used any. I am thinking with the (mostly) flay horizon, at least with the grand canyon and some of the Bryce scenary that a 2-stop hard filter (Cokin P-121) would be best. Or should I go with a 3-stop hard (Cokin P-121F)? If we were to go to California, especially some place like Yosemite should I go with something that is a 2-stop soft instead...or should I not even bother in Yosemite because of the extremely broken up horizon line. Thanks!