Nothing. You described what you had, and asked for suggestions about what to add. I think .22 rimfire would be a good addition, considering you have a couple centerfire weapons.
Another fun gun is a good spring pellet rifle. Cheap practice.
Thanks, Cboldt.
Ill keep my .38, since I do well with it at the range.
I might try to get a 1911. My dad had one and I fell in love.