It depends on what you bought...
Plain jane pencil barrel generic AR-10? In .308win??
Configuration is going to have something to do with an "ideal" scope...
There are 16" barreled AR-10(T)s out there, and 20" and 24" Ts. Maybe you have a GA Precision AR-10, or a Knight's?
Point is, what're your expectations? The Aero-Precision one piece mounts are a great choice and enable lots of mounting flexibility.
Aluminum tactical rings are also very good, but the cantilevered Aero is really a great value.
A match quality AR-10 can really perform with a quality scope. Athlon Optics (I am a dealer), has their new Ares series in 2.5-15x and 4.5-27x. These are 30mm tube FFP, illum reticles w/moa or mil-rad matched turrets, argon gas filled and top quality lens systems and internals sourced from Light Optical Works of Japan. Athlon assembles these in China and they sell for $800-$850. Lifetime Transferable warranty with all warranty and service work done in Kansas USA. I have mounted my Athlon Cronus BTR 4,5-29x 56mm in a 34mm Aero-Precision base on my 20" GA Precision 10(T) and it is a real fine match. The Cronus BTR is comparable to the S&B PM-II, NF ATACR, Kahles tactical and the Razor II which all sell for lots more than $1800 which the Cronus costs. Catalog download link at bottom of homepage <
www.athlonoptics.com>
I also have a 16" barreled Eagle Arms AR-10, and another GAP 10(T) w/18" carbine gas setup. If looks matter, a shorter bodied scope has better apearance on a carbine. the Cronus BTR with A-P mount will deliver though, but looking at 13lbs at least. No AR-10 is gonna be lightweight. Mostly because of the boltcarrier group and ammo.
Really comes down to your rifle's capabilities. The leupold mk4 4.5-14 is nice & compact, as is the mk4 1.5-5x. Both cost a lot of money and the optics are not too exciting.
A 4.5-27x like the Athlon Ares or Midas will enable fast response with great eye relief and lots of illum reticle settings. On a plain carbine, hard to beat the Burris 1-4x Tac-30 or other upgraded similar scopes in Burris' line. Athlon will soon have a 1-8x short-bodied tactical scope, and has 1-6x now for about $550. I would wait for the 1-8x, maybe go with a Burris until it is introduced...