If you have access to long distance range Id talk with guys there and look at their scopes, you will really get a good idea whats out there. What works for one guys might not the other.. I read all kinds of good stuff on a Burris XTR II, almost bought one online but found one in the gun shop..I actually didn't care for it and bought a scope Id never think to buy ...a Bushnell DMR, and I love it. Hands on with an optic really helps..especially when buying something with a hefty price tag.
Cheers!!