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

I still long for my Philips 212 turntable with the green elevator buttons. However, it is the Naim Superuniti that has given me the most
music and versatility. It now runs through a Primaluna HP amplifier that has added
the missing tone and fullness that the Naim
lacked. Pushing a pair of Focal Kanta 2 speakers. This rig will keep me happy for a long while. 

Antique Sound Labs Wave 8, the only item (I own) going for more than when they were new. 

My 15 year old UK made Castle Richmond 3i small standmounts. Recently dug 'em out for a change from my Quad S2s and they ain't going back anytime soon.  

Nakamichi Dragon

My Musical Fidelity M6PRX amplifier. Since I got this amp I have tried others including Bryston, Mark Levinson and Coda. I always come back to it. It seems to have great synergy with any speaker I try and it just sounds great.