Depends on the useage. Is this to be a range gun, home protection gun, or CCW? Also, slides can loosen a bit with time as they get broken in, or at least that is my experience.
From what you're saying, I'm guessing CCW. In that case, what sort of caliber are you looking at? From her issues with pulling back the slide I'm thinking .380 or 9mm myself, as such, perhaps something like the Ruger LCP?