if you want best (or atleast better) but stay "cheap" id recomment a DPMS SASS. its a great rifle with all the bells and whistles u need.
I just finished building up a .308 for long range (my .223 just wasnt cutting it after 500 yards). Its a POF complete lower NP3 coated with JP trigger and PRS stock w/ mono-pod. Upper is POF w/ mono rail NP3 coated. NP3 coated bolt carrier group. JP match 22" 11.25:1 twist barrel with adjustable gas block and JP brake. Waiting on GAP to start selling their 13" mono rails so i can cover up my gas block/gas tube.
lease:
ADM mount and sightron 8-32x56 scope not in pic.