I'm using a 10+ year old Logitech MX510. I've had to repair the cord once, and I replaced the outside shell with that of a Logitech G400s a few years ago, when the original paint had worn off too much.
My keyboard is an HP Wireless Elite V2... because I have a weakness for chiclet keys.
My headphones at the moment are an old pair of earbuds that came with a Galaxy Nexus. They *were* a pair of Jaybird Bluebuds X, but after they died inexplicably for the second time in less than two years, the company refuses to get back to me. =(