Just thought I'd reply to ammend my optics recommendation. The ACOG NSN is a great optic, I definately stand by that. However, it's a very high end combat optic. For the purposes that you described, a more affordable option might be something like the ATNc 3-9x55 LU LIT-RETICLE SCOPE(pictured below). Here's the specs...
Magnification: 3-9
Objective diameter: 55 mm
Mounting: 30 mm Rings
Bullet drop calibers: .223, .308, 30-.06, .270, 7mm Mag, .300 Win mag
Rangefinding: 1000 m
Illuminated reticle: Yes
Length: 332 mm
Eye relief: 90 mm
Power source: 3v (CR2432) included
Battery life: 100 hours
Sun shade: Yes (40 mm)
Recomended use: Ver
Adjustment: windage and elevation at 100 yds 1click=1/8 MOA
Description:
Versatility is the name of the game. Our 3-9x55 can be used for long, medium, or short range shooting.
Superior optics and a large 55mm objective lens provide you with one of the brightest scopes made.
The interchangeable cams for the BDC lets you go after Big game with rifles using .300 Win Magnum or 7mm Magnums cartridges, as well as varmint rifles with .223 or .270 caliber's, while the .223, .30-06 or the venerable .308 can be relied upon in the tactical environment.