Ditto the bad/good on the Chinese copies. I'm sure everyone has different luck -- at the shop I frequent, word is the Polytechs often have better accuracy than the rack Springfields.. not bad. Also, you get a forged receiever, if such is important to you.
Consensus in previous threads points to --
1 -- do you just want a beater shooter, and don't mind crass comments on the line? If so, definately the Norinco.
(Yes, you will get crass comments -- I think a thick skin is a necessity with one of those babies.. or a private range)
2 -- do you want something finely polished, that everybody agrees is a nice rifle? Springfield.
3 -- want a "project gun" to work up to as near to USGI spec as you can get it? Polytech or forged Smith Enterprises receiever, lots of shop time at Fulton or Smith Enterprises after.
Much wisdom in the archives... all the above explained better than I could start to.
Have fun.. wonderful road.
(I'm partway through option 3 personally, for what it's worth.)
-K