When I save stuff from 'chan and 'booru boards, pictures that I don't find outright amazing, I leave in their normal filename formats, and save into one large folder all the time.
After the folder reaches several thousand pictures, I like meticulously going through and renaming all that shit, and putting it into the right series->character folders. During that process I get rid of dupes, and move stuff I want to shop into another folder, neatly file the porn, so on.
Dupe detectors only get rid of dupes - you'll need to sort those pictures eventually if you want to find anything with any semblance of speed. I just ignore the dupe detector stage since I'm going through everything one by one anyways, and it's good memory training.