Not a shooter, not a respectable example, but for a 'keeper' where is the line on condition?

Regardless of vintage and scarcity I want a perfect, untouched, unmolested specimen that is in all respects brand new with all the fixin's. Unfortunately, reality and expectations must at some point reconcile. Somewhere in the above reconciliation my wallet is involved.

I've heard:
'Post war has to be perfect, pre war I can live with a few marks'
'Buy for the three C's '


Where is your line, your cutoff?




PS
Please exclude from this discussion guns that are so scarce condition is largely irrelevant.