I'm using most of those firearms now thanks to 20th Century weapons and ArmsDealer 2.2 mods. M1Garand, USP, Sig, 1911, Glock, M16a1, M4 carbine from MW2, AA-12, Rem 1187, M-14 and others. The AKS-47 from the ArmsDealer mod looks pretty good.
Cant wait to see what kind of mods that will be available for New Vegas. Hope to see native NVGs and Thermal sights without the need for mods.