With the many choices, I'm a bit overwhelmed of what filter brand to go with. I am between an ND filter and graduated ND filter for my upcoming trip to Hawaii. I'll be using the filter for long exposure waterfall shots (ND would work here) and long exposure beach/sunset beach shots (graduated ND I assume is best for these). My questions are: 1. Can either of these filters work for both scenarios or would I really need to buy both? 2. What strength filter is the best all around for these type of shots? I am GUESSING .9 for ND, what about GND? Are soft edge GNDs often the better choice over hard edge? 3. What brands are the best? I dont want a cheap filter that will end up ruining my glass quality (ie Tiffen?) A lot of questions, I know, but I'm overwhelmed and really want to order something bc the trip is coming up fast! Thanks!