Don't know which would be a "must have" but there are a few that are in the price range that you want to spend;
Below is my Colt Officers Model 22LR, I also have a Police Positive in 38 Special and had a 1901 Army in 38 Long Colt. the OM and the Army were both purchaed for under $300 within the last five years. The PP ws left to me by my Grandfather when he died in 1991, but they are commonly avalable in the $300-500 range.
Officers Model
Police Positive
Sorry for crappy cell phone pics; better pic of Officers Model with my Grandfather's holster that the Police Positive came in.
