I could list a ton of things, much like Corey. But, if you're talking return on the dollar for performance, I'd have to say our Jenn-Air dishwasher we purchased at our local Salvation Army thrift store many moons ago.
Paid $15 for it and learned by calling the company and giving them the serial number that it had been a floor model in an appliance store. We could tell it had been used little or not at all by the way the underside and back looked. The inside was spotless.
Turns out the appliance store donated it because it was an outdated model and has plenty of whistles and bells. We didn't care how it got to the thrift store. It's wonderful and performs like a champ.
That's my story and I'm sticking to it.