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

Like mglik, I bought my first pair of the old Quads in the late 80s. Sold them when Quad announced they would no longer provide parts for the 57s. Bought my second pair in the early 2000s and kept them for about 8 years. Just bought my third pair and this set I will hold on to forever (I'm a slow learner). The Quad ESL is not perfect, but it's the closest thing to perfection that I have heard in my home.  

Merlin Music Systems VSM...

I never sold a pair and later wshed I had kept them.

I just kept the ones I really bonded with. Still own (and use) Energy Reference Connoisseur, Martin Logan CLS, Vandersteen 4A, and Wilson Maxx 2

I have also never regretted selling off a pair of speakers, even if I enjoyed them at the time. I kept moving up, and carefully.

I did enjoy an old McCormack DNA-1 power amp (and a 0.5 too) but let them go only to eventually re-buy another DNA-1 (cheaply/lucky on eBay) which is a rock-solid and nice sounding back-up amp for many speakers.     That's it.

Vandersteen 2ce Signature (II or III; can't remember which). I let them go in 1990 because I was going back to school and couldn't fit them in a dorm room. They were the first speakers I ever owned that hung a solid, deep, tall image in front of me and sounded good with either chamber music or The Chambers Brothers. So when I got out of school and had room once again...