Stay away from the Century guns, they are too hit and miss. Some are fine, some are crap. Unless you can get one real cheap, like under 400.00. The DSA and IMI kit guns are a good value, you can't build a kit gun yourself for what a DSA kit gun sells for ($795.00 to your dealer). The DSA premium guns and the FAL smith guns (AZEX, ARS, Double G, and others that I can't remember) are fine guns also. Then there are the pre-ban guns- Springfield Armory SAR-48 (Imbel reciever), Armscorp, some of the Argentine guns, and of course the Belgiums. The Belgium guns start around $2000.00 (for a 50.00)and go up the mid 3000.00 (50.63).
I have a SAR-48. It was important for me to get a pre-ban. I wanted the folding stock option. I found a folder setup last fall for my SAR. SAR-48's are currently going for 1400 to 1900, give or take 50, depending on condition and model. Folder setups- cover, springs, bolt carrier, lower, knuckle, stock- are selling for around 750.00 to 800.00.
If I didn't get a SAR I would buy a gun from ARS, AZEX, or DSA(premium). Then I would do what I'm doing next, building one of my own with a parts kit and Imbel reciever, just because.