Well my 2 cents (a bit more than that...) - the 2 most important parts of an audio system is the source (and to be more precise the dac) and the speakers. Hence I will pick the dCS Vivaldi dac and the Vivid g3 speakers.
Of all your gear, what piece impresses you most?
I like all my gear, yet the single piece that blows me away the most is my phono preamp.