"Buy the bore", as they say. Especially if you're looking for a "shooter" and not versed on what makes certain specimens more collectable than others.
I've owned at least 50 of them and still have something like twenty and handled thousands of others. Beware of what importers and salesmen tell you about their condition. Some importers will even mark the condition on their boxes as being "Very good", or "Excellent", but this is usually only based on external appearance. Because they've been through an arsenal refurbishment, many will appear to be almost new....but the bore could still be a sewer pipe, as they were shot with corrosive ammo and not always properly cleaned, afterwards. Also, the Soviets did not normally replace barrels during this refurb process. So, inspect the bore if at all possible. Most will have cosmoline caked inside, so if it hasn't been cleaned out, it's impossible to tell what condition the bore is in.
Great rifles, once you learn their quirks. Good luck!