I regret selling my Odyssey Stratos Extreme and the Kismet Reference floorstanding speakers. Only got rid of them because my wife was on my case to get rid of some of my treasures. I had 4 or 5 amps and 3 pairs of large speakers hanging around. Got rid of all of them, should have kept what I mentioned above. The Stratos would have been a great back up amp and the speakers were really quite special.
What piece(s) of gear did you sell/give away that you would like to have back?
We've all done it - sold or traded a piece of gear we had fallen out of love with, then regretted that decision at some point. If you could go back in time, but could only retrieve one piece, what would that be?