Is 1500 a fair price for a PLS? Only you can answer that for yourself, but I'd suggest you look at other viable arms in similar price ranges 1st.
Saiga and Vepr come in both 762x54r and 308
FAL and PTR both in 308 for about 1000 bucks with plenty of spare parts and mags available.
Polytech M14 maybe figure 1000 to 1200, heck of a lot better than a Springfield M1A which runs at least 2500 and up
Then you have the Century C308 which is a Cetme clone built on a PTR receiver for about 700.
20 round mags are standard unlike the PSL, Vepr and Saiga which range from 5 to 10 round mags which are hard to find.