Nikon's P-Tactical scope is very nice. There are some good deals going around right now on the M-223 BDC line right now. MONARCH glass and Nikon's BDC reticle that you can dial in using Spot On. The new M-Tactical line is $100 more than your budget but offer's 30mm tube, mil/MOA reticle and MONARCH glass. A heck of a scope for sub $400. Doesn't matter if you find a M-308 or .223 , you can dial either one into your rifle, scope, and ammo using Spot On. A very accurate and useful tool. Rant., is correct that the P-Tactical 3-9 MOA/MRAD line runs around $200. I know there are some deals to be had right now if you check around.