For $1500 you can get a nice rig depending on what you plan to use it for.
For a professional Rifle look at the Colt 6920 or 6940, LMT or Smith & Wesson are fine too. Looks like a LesBaer avatar? IMO paying for a name wont get you a better rifle, just less money to spend on ammo.
There are many speciality AR's but without knowing what you plan to use it for, I wouldn't know which direction to send you.
hi perf barrels and bolts
The Nextgen of 308 rifles