I don't know what your budget is, so I can't really advise. In my experience, sub placement is crucial, and an in-wall sub is disaster in the making. I've never heard one that sounded good; if it has any power it will rattle the heck out of the wall; and if it's in the wrong place (which, mounted to a wall, is almost guaranteed), you won't like what's involved in moving it. ALWAYS go with a movable sub if you can afford it. And two, if you can manage.