It's gotta be my turntable Roksan Xerxes 20+, Naim ARO and Roksan Shiraz cartridge. They're all individually excellent but sound even better together. Very good synergy. For me turntables are easy to love because they're mechanical and hence highly interactive.
Following closely are my Naim SL2 speakers. As an engineering type I really appreciate the science that has gone into these speakers. Love or hate the sound, no one makes speakers like Naim. The concept was to focus primarily on isolation and vibration control in the cabinets and less on the drivers which are excellent but not state of the art like some other speakers (such as Magico with their esoteric cutting edge driver materials). I often wonder what the result would be if the SL2 cabinets were combined with some Magico drivers.