Re: Best AR-15 to get. Price is not a factor.
There have been some good names mentioned if you are looking at buying a complete rig, lol at the Colt remark.
I like to build mine, nothing like putting together a rig and having it shoot lights out. My idea of a all out build: Mega billet receivers, the upper might need to be squared. A Bartlein or Krieger pipe, a nice handguard such as a Apex, Nib ARP carrier w/ superbolt, DD LPK with a Geissele, PRS stock. Glass would be a NF NXS sitting in a Unimount. Maybe a few more minor details such as a Accupod. Not sure on the caliber, something in 6mm.