Jumped on it used to have one and had to have it.... Be honest pm if necessary....... I was actually looking at a DD AR when I seen this. Haven't really been looking at AK prices lately but what I have seen has mostly been Arsenal or kit guns.
How do these compare to the Arsenal Russian builds?
http://www.ar15.com/forums/t_7_122/953892_MINT_NORINCO_56S__IN_BOX___1100_SHIPPED_.html
How am I supposed to know how you did, I see neither photos nor a price.

I think you did well given the condition or the gun(assuming a low round count) and the market for these guns currently. I paid $1300 for my 56S New in Box around 4 months ago.
You got a great deal.Keep the box,etc.The Sile,NY imported 56S are sought after.They dont have a lot of sloppy import markings as some of the other importers.Easily worth $1200
Going by the label on the box looks like sks762. Its a funny looking sks, must be a M or D.