If you own a 1911, the .22-45 is an obvious choice, as there is considerable similarity in grip, controls, etc..
Otherwise, a stainless steel ruger slabsides will do quite nicely. Give it Volquartson innards and grip, a good dot sight, and you probably will not be able to outshoot the pistol for quite a while.
Probably the most cost-effective thing to do with most .22s is to experiment with as many different types and brands of ammo as possible, and to carefully measure and record the results.
With luck, and a little effort, you will find one, maybe two types of ammo that your gun particularly likes. .22s are like that...