I was gonna go with the Sig1911, but then I read the "only gun" bit, and went with the Glock 19.
It's my favorite size pistol for an all around gun, my favorite caliber for an all around gun, and I do like DAO.
If you'd had a Sig 229 up there with the 220 and 226 it would have been a harder choice.
Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety. ~B. Franklin