Good options above, can't think of any other steel frame options that fit this criteria.
Many / most would say that it is preferable to rack the slide instead of using the slide stop lever (some call it the "slide release lever").
Regardless, many people use the trigger finger for the mag release and even for the slide stop (depends on the particular pistol). It depends on what type of compromise you want to make: Limiting yourself to ambi / reversible slide stop options cuts out a huge portion of the market, and perhaps isn't necessary. It's worth considering.