When I think .308 semi, I think of (my personal short list):
M1A: Either standard barrel, SAI Loaded (Certain NM goodies w/o the full NM price) or Scout 18" barrel.
FAL: Right Arm of the Free World. I'd want either an Israeli HBAR or a Rhodesian/SA clone.
G3/HK91/PTR91: PTR91 GI; under 1k, handles all commercial and surplus 308/762, classic green furniture, and you get to do the karate chop on the charging handle.
Now, these 3 are all considered 'battle rifles' and aren't as accurate as a SASS or accurized platform, but I'm okay with that.