Still have my perfect, unyellowed original A500 I bought from Software Hut many years ago.

I recently went through it, replaced the fraying keyboard ground strap, installed a Mega Chip, ECS Denise, 3.1 ROM, and a few other little things. Still working flawless alongside its GVP A530 playmate.
I can't recall selling much Amiga gear over the years. Off the top of my head:
Blizzard 1260: DCE model, factory clocked at 60MHz with a real 60MHz CPU. Sold it about 10 years ago along with a DCE internal scandoubler (made money on both), regretted until I got my hands on an 80MHz Apollo sometime later.
CV64/3D+Scandoubler: Great combo. I was amazed at how it transformed my A2000, but the scandoubler was a PITA to get working correctly in the A2K. Sold it after (finally) experiencing the Picasso IV, and set the money aside to get another PIV. :p No regrets.
Pegasos 2 G3: Sold it after less than a year to fund an (at the time) monster PC that I water cooled and overclocked the shillz out of. I don't miss the Pegasos, just an occasional interest to check out how MorphOS has progressed since the 1.3 days. (Or was it 1.4? I can't recall).
That's all I can think of. I do have a few things I'd like to sell or give away one of these days when i find the time.