As I read this, I see the OP is over four years old.
I also note that the LAST post is over eighteen months old.
A LOT HAS CHANGED in that time frame.
Prices have gone through the roof and then back into the basement (in some instances).
While the 'what's it worth' question can get old and in a lot of instances it IS some body who is doing all that was said above.
But as Bursits said, some of the folks HAVE DONE the due diligence. And in today's market, can STILL have questions, especially about a specific purchase on a specific rifle.
Having said all that, I've built my share of M1A's, and I love the Chinese receivers.
My second degree is as a gunsmith. During school I built two Norinco's up. I removed ONE barrel and left the other barrel in place.
On the debarreled receiver, I sent it out to be hardened. I got it back with a nice note that told me that they tested both ends and it had a Rockwell hardness of either 61 (front) or 62 (rear) and there was nothing they could do. They also answered my other question, which was that it would NOT make much difference in the receiver if I had it cryo'ed or not.
So, after getting it back, I put a USGI NM barrel on it.
Both M1A's got USGI NM bolts, USGI NM trigger groups, both got USGI Oprods (I had them already), and USGI pistons (had them as well).
Bolts were hand lapped to the receiver. All the surfaces on the trigger group (except sear engaging surfaces) were smoothed with my ceramic India Stones. Both got similar 3 - 10 x 40 scopes mounted on Gen 3 scope mounts from SAI.
Then out to the range.
Both shot fairly similar. The rebarreled receiver shot the same as the chinese barrel I left in place. Both of the weapons functioned flawlessly. I eventually sold them. And moved on.
I now find myself looking at picking up one more M1A to put back into the safe.
I don't have any questions on what it's worth because I'm by no means a noob to the gun culture OR the M1A. I consider myself fortunate.
Others are not so fortunate. Yes, I concur the constant 'what it's worth' question can become tedious. But just remember, we've had a lot of new members added to the gun culture in the past three years (over 30 million background checks have been run in that time frame).
So perhaps a revisit to this might be in order? Or not.