There are a bunch of semiautos I miss, but even more that I was more than happy to see go:
The ones I wanted to keep, but I needed money for whatever reasons:
Astra A-75 nickel 9mm, a great little gun, totally reliable.
Astra A-100. Got it cheap, it shot great, made almost 100% profit when I sold it.
EAA Witness .45 full sized in "wonder finish". Great gun.
Both Beretta 92FS's that I had, especially the second one. Near new condition and it was cheap.
Both my Beretta 84 and Browning BDA .380s. These are the all time best .380s, IMHO. I hated seeing them go.
Revolvers:
My first Dan Wesson 15-2, missed it by a buck on Gunbroker in 2006.
All the other 15-2's I've had were missed too, but the first one I really wish I had back.
S&W 28-2, well worn finish, with a target hammer and trigger, along with an action job, it was a really nice shooter. I missed it on Gunbroker in 2008 by about 1 buck and a half. I forgot about the auction.
Colt Python. I made too much on it to keep it, honestly, I like the DWs better in almost every way.
The ones I was happy to see go:
Colt Combat Commander. Colt should be ashamed to have let it get out the door. Not one good thing about it, and Colt didn't fix it, they just scratched it both times they had it.
FTL Auto Nine. Little extractor blowing .22 that I couldn't sell fast enough.
HK VP70. I almost forgot I had owned it. Horrible trigger, DAO, and polymer frame added up to a gun I really hated. I sold it almost immediately and bought my first Beretta 92.
AMT Hardballer Longslide .45 and Back up .380. The Hardballer jammed 'a plenty, and the Back Up had about a 30 pound trigger. I'm serious! It was horrible. A trip to a local gunsmith got it down to about 20.
About 30 more.
Revolvers:
Taurus 83. My first, and worst, gun. It had a defective barrel that only Taurus couldn't instantly see but everyone else could. Two trips to Florida accomplished little.
Charter Arms Bulldog. Heavy DA pull, crunchy too.