Go with the 18"
Looks as if your primary question was simply what barrell length should you go with.
I don't believe that the 18" Bbl would be all that detrimental to manuevability for CQ useage, especially since it reads like your really wishing for better long range performance. 2" of Bbl length isn't going to be a real factor either in velocity or accuracy....but if I was looking to build a rifle based upon your specs in your post. I'd go with 18"....scoped appropriatley and choose my ammo carefully.
"Get yourself a Glock, Lose that Nickle plated sissy pistol." Sam Gerard (Tommy Lee Jones)
Ignorance is Defensible, Stupidity is Not!
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