Stay away from the Mosquito; there have been many problems and that is not just internet noise. There have been improvements, but why risk it? (Unless you're looking for a hobby--tinkering with it. This from a diehard SIG lover). Ruger Mark I,II, or III, or Buck Mark; tried and true, and reasonably priced. Try them out or hold them if you can, but if not, either would do, although the Buck Mark is known for its ergonomics. I prefer it. It is more easily field stripped for cleaning. It's a great gun. You can find others, but these are all you need; they are the benchmark for .22 cal. semi-autos of their type and price range. If you spend time on internet gun forums, the two come up over and over every time a question like yours is raised.