A good quality used Mark II with adjustable sight would be my first choice,(I don't like the Mark III's) or a Buckmark (they have interchangeable barrels).
I really like my CZ Kadet .22lr (conversion on a CZ75B 9mm), but I don't know if it's any more accurate than my Mark II. Haven't had it long enough to tell.
After I did some trigger work on my Mark II, it became the most accurate handgun I've ever owned (or at least equal to my Freedom Arms .357). Trigger parts are readily available from Volquartsen and others to get the most out of the gun.