I've owned about 7 sks's over the last 4 years and I would say the best one I had (before I sold it lol) was my Yugo SKS. I am sure the fellow who bought it off me is very pleased with the rifle.
Anyhow, this is how I see sks's in my eyes:
Russian SKS - excellent gun, sorta rare, kinda pricy
Norinco SKS - excellent gun (if of the threaded variety), cheap, chrome bbl
Norinco SKS-D - excellent gun, a bit of a pain to load the short 5rd mags, so get some 30(5) rounders for it, can be made to look sorta like an AK if that's what you're going for.
Yugo SKS - my primo choice, excellent metal work, beautiful hardwood, length of pull is better (longer rifle made in europe vs china), good resale value, can be had in like new condtition if you're lucky.
p.s.
any comments such as the one made by "303carbine" make me roll my eyes at what is wrong with the gun community... There is no such thing as a bad/ugly/useless gun. I like all guns some more than others but would never out someone down. Would you tell the young kid at the range that his 50 dollar single shot cooey 22 is a piece of ####, to his face if you can tell he is having fun and at least he is "one of us" a bonafide gunowner.