So what single piece of gear can you never imagine parting with? Perhaps a purchase that has proven to be so awesome that you would be unlikely to take more than what you paid for it. Perhaps you consider it the best quality youve ever owned, maybe the most handy and most often used, maybe it made the biggest difference in your home theater, or maybe its just the best value in gear you have ever experienced. For me, its very easy, my Sennheiser HD 650 headphones. As headphones go they were pricey at $350 new, but they are also my most treasured and one of my most often used pieces of gear I own!