I've always had a soft spot for US military firearms, unfortunately my current economic situation doesn't allow for the premium these guns rightfully carry. I have an M1 Garand, I'd love to fill out a basic WWII GI set by adding an M1 carbine, M1911a1, and 1903a3.
Of course if you include foreign military I'd like to do an Allies set: all the previously mentioned guns, my 91/30, add an Enfield, and the appropriate handguns.