The most important factor is the size of your room. I have M22's and QS4's and I think they sound superb, but then I have them in a small room (12x13x8). In a large room, I would go with the M60's and the QS8's.

If you do this search in all posts and forums - qs4 alan - joined with AND in the options box, you'll get all the info you need.