I'll put my two cents in here. I coached the Purdue University team for a number of years, and have built and maintained .22 autopistols forever. I would advise you buying the best you can get and not wasting your time on Rugers, Buckmarks, and other field guns that you will upgrade from in short order anyway.
If you are buying a .22 Auto for conventional pistol 900 matches, look at the Smith 41 with the 5 1/2" barrel or the Marvel .22 conversion unit for the .45 frame. Buy them new. The current production guns from Smith are the best they have ever been, are drilled and tapped, and are very reliable. You may have to get a lighter spring for standard velocity ammo, as Smith ships a slightly heavy spring. This can cause failures to feed. Look at grips from Nill, Vitarbo, or Morini. Remember, Bill Blankenship won five national titles with a box-stock 41 and that ain't hay.
The Marvel is very reliable and dead accurate with any decent ammo, by which I mean Eley, Lapua, SK Jagd, or RWS. The fact that it will get you acclimated to a .45 drawbar trigger doesn't hurt when you want to put the .45 top back on for the rest of the 2700 either. I think it's the best .22 to come along in twenty years.
The other pistol you should consider is the Walther GSP Expert which just the nicest package going. I won two state championships with the 41 and two with the GSP, but I think the GSP is by far easier to shoot. If you want to shoot 900's and International, it's the way to go.
If you have to shoot optics, buy a 1" Ultradot and be done with it. Best you can get for bullseye. Mount it as low as possible and pack spare batteries.
Above are my opinions earned in coaching and competition, and are not an endorsement by Purdue University of any product or service. I am not a faculty or staff member of said institution, but wish them all the best in thumping thier competition.