Lotsa good options listed ahead of me in this thread, IMO.
I'm not a Ruger fan. Disassembly/reassembly is a PITA. None of the Ruger owners mention that. They also mention aftermarket barrels. Why? Because a Ruger usually needs them to be accurate per shooting a cloverleaf. Their triggers often leave a lot to be desired as well. Lastly, I've had Ruger owners shoot one of mine & proceeded to out-shoot their own guns. There's also the political history with Bill Ruger during the AW & mag ban in the early 1990s. He shafted gun owners. Do your own research, as I've had 4 bans for politics in here.
I wholeheartedly agree with the Walther GSP as I own one. Amazing trigger, amazing accuracy. Walther builds Olympic-grade guns, so some of that trickles down, IMO.
I also have a Hammerli International, a modestly priced "target" rimfire. They're quite frequent on Gun Broker as well.
Another Hammerli I have is the Sig Trailside. Their value has gone up since Sig dropped that model, but they can easily be found.
My fav are my Buckmark models. I have both a bull bbl Camper model that's also threaded & a slabside model. Both will do a cloverleaf at 20-25 yards if I don't screw it up. No need for a new bbl or new trigger or extra expense. Just clean it, oil it & shoot it. Some Ruger owners will complain about the stripping process on the Buckmarks & that's fair. I get around that by simply not removing the top strap when cleaning. I spray the slide & recoil spring clean with brake cleaner, swab it with q-tips & oil it. Done.
Since I also have varied tastes, I also have a mock Beretta 92FS in .22LR and a mock Colt 1911 Gold Cup in .22LR. Sadly, I haven't shot them yet, so I can't comment on their performance. I don't know who made these, GSG or what. But they're seemingly nicely fitted, don't rattle & (most importantly)
feel solid. Both were under $500.
Climbing up on my soapbox for a moment here, a search like this thread shows why we need to support local gun shows. No shop anywhere is going to stock a huge variety of rimfire pistols, there's just too many of them to do so. But a gun show is a good opportunity to find that no-longer-made model & actually hold it in one's hand, judging its balance & quality, IMO.
I got my Walther GSP gently used at a gun show as well as my slabside Buckmark. Yes, I skipped the jerky tables.
Gun Broker is an excellent way to discover unheard-of before models. One can limit their search by pricing, leaving out the $200 guns and the $1200+ guns or anywhere in between.
On ammo, I have had/have great luck with Blazer rimfire 40gr ammo. Doesn't matter the gun, they all seem to like Blazer. It used to be $20/brick but like everything else, it's gone up some. It can still be found for under $30/brick though.
My advice is worth exactly what I was paid for it............