I thought about it for awhile, but decided against another weapon (rifle) that takes a different caliber, different mags, etc. What was not pictured (but is now, see below) is the Remington 700 PSS w/ 20" bull barrel + Leupold 3.5-10X40 M3 w/ Premier Recticles USMC Mil-Dot recticle. Nice 600-700 yard gun. The smaller barrel (as opposed to the standard 26" stock one) makes it easier to handle in smaller spaces, but takes an 800 yd rifle down to 600-700 yd.
Right now, my focus is getting rid of some extra gear (HBAR, MOLLE II, etc) so I can get a CCW and Tactical (both) handgun. Thinking of something like Glock G23/G27, Sig P229/P239, HK Tactical/USP Compact. I want a big gun for fun, but something not so big to carry.
The M4/Rem 700 is a nice combination. Now, I just need to add a handgun.