I've got two S&W 22A's and really enjoy them. I haven't had any problems with them and added a RedDot on both of them. Really fun shooting and they can be found pretty cheap on the used market.
My Dad just got the SR22, compared to the .22A it's trigger release is a bit long, otherwise and a very nice shooter.
+1 on the 1911's .22's, I like them all and the Sig would be my choice. Browning also has a scaled down model of the 1911 that's really nice.