honestly, the Auto Ordnance guns are kind of a good from far, but far from good proposition. When you see one in person, the wood is nice, but the receivers and some other metal bits are crudely cast and look nothing like an original up close. They are also not dimensionally like a real carbine - AO stock sets don't swap onto a GI carbine, the GI gun will sit too high in the stock. They also seem to only work well with AO-made mags. You hear that over and over. GI guns will work awesome with the $15 (in the states, more here) KCI mags all day long, and those are newly made to USGI specs from South Korean military machinery.
Used they tend to sell in the $1000-1400 range, Switzers has one at auction right now. Cheapest way to get into the NR carbine game, but a GI gun with a new NR barrel from a good barrel maker is a much superior firearm in almost every respect, except the stock won't look as fresh. It will cost you a little more, but be a "buy it for life" kind of gun.