I think it is a matter of what is practical for you and your room.

I now also have 4 170's for surrounds, and for DVD-A and SACD, it all matches very well. I may be biased, but I have not heard a system that "pans" as seemlessly as mine. I have heard the multipoles, and what is interesting is front/back or vice versa pans.....from a diffused sound to a direct one...it may be seemless, but sounds different...diffuse to pinpoint I guess. (hmm..I went a little off topic).

-curtis