What's the best and/or favorite piece of equipment you've owned? And do you still own it?

I'm in a monogamous relationship with my Shindo Giscours preamp.
Til death do us part.

My favorite is my current two way system. A Klipsch K-402 horn with an 1132 driver on top of a self built bass bin derived from the Klipsch MCM 1900 MWM bass bin but built with a 108" throat. A single fold horn and it goes down to 27hz before it starts dropping off. Amazing headroom, presence and fidelity. It’s fun to watch the expressions on the faces of those who stop in to hear them for the first time.  The other important part is the Xilica XP3060 and it is key to making the horns sound right which it does so well.

Magnepan 1.7i's.  Fantastic speakers, bargain price.  

My first TT: Thorens TD160

SOTA Sapphire w/MMT arm.  I got it used in 1987.  I've changed &  upgraded & cross-graded everything else in my system more that a dozen times, but I've never felt the desire to change my SOTA.  Still love it today, and I'm always excited to plunk down some vinyl, whether it's an old average pressing, or a pristine Mo-Fi pressing.