18" barrel with .308 can go past 800. Long eye relief optic options: you have one from Leatherwood Hi-lux and another from Leupold. The rifle can also take standard scopes; it ships with a pair of 1" rings. Depending on the size of the scope, you will likely need to take the forward rail off for clearance. No big deal.
No one can tell you which scope to get as it is based on what you can afford. General rule of thumb, get the best one you can afford. Even if it's a $300 unit, it's still better than no scope at all for long range shooting. Can't hit what you can't see.
Last edited by fmunk; 01-18-2013 at 7:49 PM..