What speakers have you mistakenly let go and then later repurchased?

Miller Kreisel S1B pair. I found a pair of Satellite 1B decades later, and was surprised how good they are, now that I have a better idea how to integrate them with a subwoofer, and use the variable crossovers to allow for different placements.

The first were AR3a's.  I've now had three separate pairs!  I have owned 2 pairs of JBL L100's.  I wish I'd have kept Totem Sttaf and Platinum Audio Solo's.   I also owned 2 pairs of Solo's.   Regret selling B&W 804 Matrix.  I once put all my audio possessions into a spreadsheet and came out with the same conclusion: 

I'm sick :)      

@rettrussell 

😊

Heard this story many times.

Lived joyfully with Quad 57s for years. Then sold them to get dynamics bass and treble. (Probably also never had the right amp)

Always missed them. When I saw an ESS rebuilt pair, grabbed them. 
Now, would never have any other.

Vienna acoustics Beethoven, I tried many speakers that could go louder or had harder driving bass, even the VA Strauss didn't have the mids and top end of the beethovens. Now they're serving ht duties in my tv room, but upgrading from them cost a small fortune.