Frank, my preference would be either the M22 in or on wall model. The bass of the M22 is at least as strong as that of the M3, but the M3 has a hump in the upper bass around 100-150Hz which gives an impression of better bass farther down in the frequency range. I prefer the flatter M22 for the bass range. In either case, a small sub which can be quite unobtrusive significantly helps the bass and would be highly desirable unless it's not at all acceptable in your situation.
I don't have personal experience with them, but the Axiom specs are essentially identical for the in and on wall models. My view is that the appearance of the on wall is nicer.
