The Norinco is a decent choice except that from personal experience I guarantee you will have to buy new mags for it, because the ones it ships with are effing garbage. The rifle itself is awesome though, the stock upper shot really nicely and accurately with 3 different kinds of ammo I tried.
Its got a flat top receiver and has lots of awesome features that are so "awesome" that the US state dept won't allow any American rifles with those features to be exported to us.
However, its a 14.5 inch barrel. If you're hard up about 20", you'll need to buy a new upper, adding +$500 bucks to the price of the stock Norinco (about $775 after tax at Marstar). You might be able to sell your Norc upper, maybe. If you can live with 14.5" barrel you can get an AR for under $800 bucks, and that is really hard to beat.