If by preban you mean 1989 or older, I would get one of thoes if I could find one. These are the true prebans.
If by preban you mean 1990-1994, I would just buy a new gun today. There is no difference between the guns manufactured now and before 1994.
As to the question of building an AK from a parts kit: if you are a person who can make things happen, go for it. If you are a little hands off, buy one assembled.