Of all your gear, what piece impresses you most?

Bel Canto ref1000m monoblock amps because they are everything I could ask for in an amp in a very small and non-obtrusive package. Modern technical innovation applied to home audio at its best.

Also the latest addition, a Pangea power cord, just because of the build quality and heft plus it looks awesome (as power cords tend to go).

The gear that impresses me most is not necessarily also the most irreplaceable. There are many very good amps and power cables in the sea.......