I can think of a couple of others like the Walther P22 with the target barrel or the Sig Mosquito or the Browning Buck Mark. I can't post any pix from here but I'm sure somebody can...The Browning and the Walther are comparable in price to the Ruger. The new Walther looks more like one of Captain Kirk's phasers (not the ones from the Picard era!) than a normal handgun.
There's really only one suitable training pistol in those three you mentioned.
I'd stay away from the Walther P22 to prevent a brand new shooter from expecting that all target pistols will have such a rotten-assed trigger as the Walther does. It's also a problematic gun as far as reliability and manufacture is concerned. It's not half the .22LR target pistol the Ruger is. I don't have anything very good to say about the Sig Mosquito, either.
Get something *good* for a first-timer unless you expect them to unlearn a lot of bad education. The Browning Buckmark is a very good target .22, as well as the Ruger.
Cool stuff, ExSoldier! I’ll have to check all of those out. :)