I just built an Aero Precision AR-10 in 6.5 Creedmoor. I'm looking to do some long range shooting 500+ yards (I'm not planning to be some 1000 yard wizard) just would like to be comfortably proficient at the longer ranges, and am currently looking for a scope for the rifle. As some backing issue it's a 20" Ballistic Advantage barrel with a 1:8 twist. I'm shopping around looking in the under $500 range. The running favorites are a 6.5-20x44mm Vortex Viper; a 6-24x50mm Vortex Crossfire II; or some version of a Leupold in the 20+ magnification range (watch eBay and gunbroker a lot wouldn't mind used for Vortex or Leupold with their warranty). One outside contender is the Riton 5-25x, a local gun store recommended it, but I don't know anything about the brand. I'm open to any thoughts or suggestions, I'm more partial to Vortex or Leupold, as I've owned both and loved them.