Ruger makes a great 22LR revolver.
Have you tried any of the larger caliber handguns? If you have and lines one you van get a .22 that word be close to it to train with.
Otherwise there are a lot of good ones to choose from. Personally I have a S&W M&P22, which is similar to my M&P9.
Most of them tend to run under $400.
Ruger also makes some very nice semi-auto pistols. I think it would be up to you and what you are comfortable with for deciding which to go with.
I picked up a Walther P22 years ago for exactly this. Cheap, easy to break down, and cheap to use. I still plink with it all the time.
In my opinion, every handgun owner should own a good .22. It is by FAR the best way to become proficient at shooting a handgun accurately (not to mention a fraction of the cost of centerfire).
Marlin 60