Forgive us, but you've just asked us something along the line of: "I'm going to buy a vehicle, which one is best." Are you pulling a trailer with it or do you want to go fast?
Okay, .308. What are you hunting? Where are you hunting? Do you plan on hunting anything else anywhere else?
A good all-around choice for a centerfire rifle is a 3-9x variable power scope, typically with a 40mm objective. A Duplex reticle is the best choice for most situations. High quality mounts are also important.
Avoid scopes that come in a a blister-pack. Scopes with a solid warranty are better than those without. Chinese stuff comes cheap, as do most of the parts that comprise them and that will fail you later.