The K-22 and its later variants Models 17 and 18 are considered the cream of the rimfire crop for many shooters. They are K-frames with a 6" or 4" barrel. These are usually blued and rarely in nickel.
There are also J-frame .22s, Models 34 (blue) and 63 (Stainless).
The current medium frame in stainless is the Model 617, available in 4" or 6" barrels and 6-shot or 10-shot cylinders.