I own many .22 handguns, and there are still others I want. If I had to narrow it down, it would be really tough. I think aesthetics are as important as function, thankfully there are plenty to choose from.
These are some excellent and beautiful looking plinkers.
Colt Woodsman
S&W Kit Gun
S&W K-22.
Browning Challenger (Belgium made)
I've have these for bullseye, not plinking, but I wouldn't part with them either.
S&W 41
High Standard Victor
Hammerli 208
I have some others that I'm not as fond of. I have a Ruger Mk II which is ok, but nothing too special. I'd prefer the S&W 41 to it any day, but there is a price difference. I also have an older High Standard Model B, which is a beautiful gun, but not my favorite shooter. I have a Ruger Single Six, the old model convertible, and it is fun but I prefer my S&Ws to it.
I guess I'm addicted to .22s. They for the most part make up the bulk of my guns, both in handguns and rifles. I got addicted to Winchester pumps and autos, that spread to target .22s, both rifle and handgun, and then it just went a bit haywire with what I considered classics all around.