Equipment that has made you 'stop' looking?

Pass Labs.  I downsized from a Pass Labs X250 and had instant regret.  Went through many different brands and a lot of money before I finally realized what I needed to do.  Bought a Pass Labs X250.8 and haven't changed a thing in years.

PrimaLuna Evo 400 power amp
Kuzma Stabi M turntable
Kuzma 4-point 9 tonearm
Lyra Etna mono and Etna SL stereo cartridges
Martin Logan CLX loudspeakers
JL Audio Gotham subwoofer
fo.Q TA-32 and fo.Q TA-102 tuning tape
PPT Total Contact (contact enhancer)
Synergistic Research SRX power cable.
Mapleshade Samson maple equipment rack
Arya Revopod footers
Furutech NCF boosters
Moon 810LP phono preamp (might look for handwired unit one day).

All of the above are giving me complete satisfaction, for the foreseeable future. 

Ayre Acoustics Twenty series.  Happy Listening!

B&W Matrix 800. 

I had gone through probably a dozen pre amps and finally just got an aesthetix Janis signature and was quite content until one day I walked into see a movie (James Bond) with my wife and an aesthetix calisto eclipse came up.  I had only seen one or two come up in the last few years, but this was in excellent condition and had the single power supply with the reinforced case.  As the light dimmed, i couldn’t stop thinking about it, so I snuck out in a slow passage and just bought it.  After selling my Janus Sig it only cost me $600.  It has stayed in my reference system for the past 5+ years and has satisfied my need to look around.  The only thing I can see is that I have been looking for an Io without volume to pair with my callisto.