The BlackWidow seems (mostly) to have a good reputation. I'll probably buy myself one for ****s and giggles eventually, because I wouldn't mind making myself a WhiteWidow, and because I kind of want a keyboard with macro keys again.
I do have the Ducky Shining, though, and its very good. I've only had it a couple of days, mind you, but so far I only have two complaints. The little feet to lift the back of the keyboard up are pathetic - they only lift it buy about 1mm. I stuck a few coins under there and now I'm good to go. There's also one key (part of the top right hand shortcut key cluster) on which the backlight won't turn off, even if the computer is not on. Not sure why its doing that, but whichever of the "1x" "2x" ... "4x" keys I have lit up won't go off. I haven't even bothered trying to figure that out, so it might be a simple fix, but even if I can't its still not a huge problem.
What I'm getting at is the Ducky is definitely a solid choice. Prettymuch all the people I've seen on here and on /g/ are happy with theirs, including myself. I wouldn't discard the BlackWidow as a choice, either, but of the three you mentioned I'd definitely go with the Ducky. Plus with the Ducky you get your choice of backlighting colours - depending on where you're buying from you might be able to get blue, white, green or red. I've got white and it looks amazing.