As someone who is a bit biased, I would say the PROSTAFF 3-9 with BDC reticle is tough to beat. Best of all it more then fits into your price range. By choosing the BDC reticle you can use Nikon's Spot On Ballistic Program to dial in your rifle,scope and ammo to obtain the greatest possible accuracy.
The PROSTAFF has fantastic light transmission for those dark days or early morning late evening shooting. I have even shot hogs with mine under a full moon at 100 yards.
Plus, Nikon's outstanding Lifetime warranty is always nice!
I hope this info helps?