My wife is due and I’m having trouble choosing the final installment in the “my collection must be perfect before baby” fit. I want to add a special 22 revolver in 4”. The smith and Wesson models tend to confuse me but I’m looking at the following. Model 617 Model 18 Combat Master Model 17 Target Master This will end up being an heirloom and something I might have work done on. Help a guy decide. What do you recommend? Doesn’t need to be a smith.