Good luck, the only semi auto .308s I've seen in that price range lately have been VEPRs and Saigas. Saw a PTR recently but I can't remember the price, over $1K though.
I'd suggest saving and waiting out the panic for an M1A, maybe go ahead and buy some mags for it if you can find them.
Sgt. of Marines, 5th Award Expert Rifle, 237/250
1st Award Expert Pistol, 382/400
D Co, 4th CEB, Engineers UP!! OEF 21JUN-20SEP2011