That's a lot of controllers right there.
I'd imagine something like one of those ottoman/foot stools with a bit open storage compartment inside it would hold a good number of controllers to have them readily accessible. Get some foam core board and section off the inner compartment to keep things a bit more organized. Then just stick the extra ones in a storage bin in the closet.
Or get yourself one of those cheap nightstand with drawers at Walmart and use foam board to section off the drawers for a nice, hidden, quick access controller storage cabinet.
I've always like the idea of a peg board hung on the wall and hooks to hold the controllers that you use most often as well.
Don't really have much of a controller insanity myself. Not anymore. Back when I had a bunch I used the nightstand method. Found a really nice one at a Salvation Army thrift store for just $10. Another $10 in spray paint and foam board and I had me a real nice, custom controller storage. Can't seem to find the pics I had taken of it now, otherwise I'd post them here.
In other news, if you're looking at whittling down a bit, I'd be happy to take one or two of those PS3 DualShocks off your hands if the price is right.
