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Hehehehe...funny, I'm looking at your shots and am like HEY that guy is in oregon!!! lol.
I dunno,your pics are great too, but I feel filters are important, or can be important, for waterfall shooting. Granted I feel I'm in a minority and don't use a polarizer hardly at all, but meh. ND filters are useful imho. Could you do without them, sure, but they are handy. Maybe less needed with clever use of your camera's features (you figure it out =p).
One of the shots is this place, right:
That one was with an ND filter...couldn't have gotten that look without it. Then again, sometimes I like to get that look but it does away with too much detail in medium sized falls and some people don't like that (I generally do), so to each their own...your shots are GREAT though, better than mine for sure, so ;-)
For lens choices, for UW on crop:
1. Sigma 8-16mm. You can use big big filters if clever, by the way. I did. ;-) It's going to be the widest, and the sharpest in the corners. If you get a decentered copy, send it back.
2. Tokina 11-16mm 2.8. Mine was nice, sharp, but had extreme flare problems. Has extreme CA, but that can be corrected. It's a very nice lens, but the corners aren't as sharp as the Siggy (don't pay too much attention to tests of the Sigma without using it yourself, it has field curvature). Takes filters (YAY). I used one of these for a long time, too.
3. Sigma 10-20mm (the slower version). I've never used one , but others swear by it.