If you're looking at DPMS patterns the Larue & KAC and would be out out since the uppers/lowers aren't technically 100% DPMS nor Armalite compatible (they are hybrid Armalite/DPMS designs)
If budget is of no concern, the PredatOBR is the way to go.
Otherwise, any of our cheapie 308's would work great as a general purpose battle rifles. That was my personal goal when I got my 308 (ended up with a CMMG MK3). I wanted something I could use as a battle rifle but able to reach out for long range engagements if need be. I'm not a weight weenie since I got used to carrying an FN-MAG (M240) while I served in the military, so I don't mind that my 308 is on the heavy side.