Buckmarks and Rugers aren't exactly "little" but they are superbly engineered.
Ruger's website:
http://ruger.com/products/markIIITarget/models.html - mkIII target models
http://ruger.com/products/2245/firearms.html - mkIII 22/45 models
(a note, Ruger posts MSRP pretty high, you should be able to find these at least $75 lower if not more)
I own (and shoot the snot out of) two Ruger rimfire autoloaders, they started out as mkIII* models and I've done some tinkering inside to remove some un-needed safety features Ruger's lawyers added and upgrade some parts to stuff further past my abilities to outshoot.
* (means "mark three" as in the third major design generation)
There are mkII models out there used, and they will probably be in good shape unless someone got inside with a Dremel, Rugers are quite robust. mkII would have a heel magazine latch instead of the button behind the trigger, and are great shooters. I think mounting optics on a mkII is more difficult, I don't have details there except that a mkIII will have a weaver rail in the box with most models.
Ruger makes the 22/45 as well, which is essentially their traditional rimfire pistol with a polymer grip frame and a more upright angle to mimic the classic 1911 angle. While the durability of polymer might be debatable, it is surely robust enough to handle a .22 target pistol's needs.
All of those came in various finish and barrel profile options, I like the 5.5" bull barrel's balance, but I wouldn't turn down any of them except perhaps the 10" model, that one should have a shoulder stock or something.
Browning's website:
http://www.browning.com/products/ca...ag_=006B&catalog_=B&content=Buck-Mark-Pistols
Browning makes a LOT of models of the Buckmark, I hear good things but ended up liking the ergonomics of the Rugers best, so I'm no expert.
BUT ... Browning makes a
Buckmark Rifle as well, had I known that when I started out my gun safe might look a bit different right now.
A carbine that shares mags and parts is a great thing, in my opinion.
Thinking of carbines, if you have a 10/22 rifle, Ruger is making the
Charger pistol based on the 10/22 action, at a MSRP of ~$380 you could probably find one for $325 or so and it would share magazines.
There are other .22 plinking pistols out there:
Walther/Umarex makes the p22 (search the forum for reviews, I like mine for a trainer, not for precision shooting) it is more like a miniature duty pistol than a target gun.
Beretta makes the
U22 Neos, I'm no expert on them but I'm sure someone can give you a mini-review.
S&W makes the 22A, I've shot one and liked it, but again I'm no expert
Avoid the Lorcin/Bryco/Jennings guns in .22, they're supposed to be cheap last-ditch hideout guns, not target/plinking pistols.
Beretta makes a few mouseguns in .22 as well, the
Bobcat is the modern one and looks like fun to shoot, although I think that such small guns will amplify any error on the shooter's part.