What exactly is your price range? $100-$200 difference buys a lot of additional scope at the entry level. Also, did you want a large objective or not? Most of the fixed power tactical scopes are going to be around 44mm, but you'll get better low light collection with larger objectives. Some of mine are 56mm, but like I said, the rifle system gets heavy quick.
IOR makes decent scopes. Personally I have no experience with them, but long range shooters I trust and do have first hand experience recommend them all the time as good entry level glass. A basic fixed 10x runs a bit more than your Leupold though:
http://swfa.com/IOR-10x42-Tactical-30mm ... 48778.aspx
Options include parallax correction (often incorrectly called "side focus") and lit reticules. I have lit reticules in mine, but honestly what range will let you shoot at night? If you had land/hog hunting or something that might be a great feature. Cheaper fixed power scopes have parallax correction where you have to twist the objective lens, whereas "side focus" is a knob on the side (some have a fixed parallax correction, typically 100 yards). When behind the scope you really can't operate anything but a side knob. As you're changing ranges you need to change your parallax correction since it's only technically correct at one distance. I personally think that side parrallax focus is a critical feature.
If you want cheaper, this is about the cheapest scope that can be useful for your purpose:
http://swfa.com/Bushnell-10x40-Elite-Ta ... 48273.aspx
Interestingly, either it's gotten cheaper (IIRC, was $399) or this isn't the same model that Barrett use to ship with their fifties. I would recommend this route only if you need a scope now and wanted to buy something better later.
The Leupold Mark LR/T series are nice, but practically a bit more coin than the scope you listed.
http://swfa.com/Leupold-45-14x40-Mark-4 ... P2549.aspx
That's just a initial offering. Couple of things to be aware of. First, notice how lower end tactical scopes which are intended to have their windage/elevation knobs used often, the knobs get real big? Not bigger as in larger around so as to be easier to grip, but longer. It's because they are trying to keep costs down while providing the additional functionality a tactical scope requires over a target/hunting scope. Making the internals small and precise gets expensive quick.
Second, don't get a scope where the turrets and reticle are in different units unless you can NOT avoid it. If the reticle is MOA, get MOA turrets. If the reticle is Mils, get Mil turrets. It just makes sense. However, on the lower end tactical scopes they will often use the old MC Mil-dot reticle (nothing wrong with that, it's a good basic design), but then because most shooters in the USA are only use to MOA, they put MOA turrets on it. I have both, but have been able to avoid mixing. My preference is for Mils. The metric system is makes more sense than fractional systems like MOA. Good idea to know both.
Lastly, you have a .308Win, so even the basic tubes will be fine. However, for very long range shooting you often need the larger 34mm tubes to have enough travel. FYI, gotta make sure your base has a bit of forward cant or else you might not have enough either.
