Personally I look for -2 guns and endurance packaged guns that are pre MIM and lock.

In regards to putting lots of rounds through the older ones, I am of the opinion that if and when I shoot one out of time, I will send it in for repair (I have a couple that need to go in at the moment). If I have shot a Model 29 beyond repair with moderate loads, then I am a happy camper and I have used it to its fullest and I deserve another.

Life is too short and bad things happen to good people. Then someone else gets to shoot those guns you were too worried about babying to shoot and enjoy.

Enjoy them with friends and family or by yourself, but enjoy the Model 29s while you can and with no regrets.