I have the M22, vp150, and qs8 and my room is larger than yours. For movies I sit about 12' back and with a good sub you'll definately be happy with the M22's. I just got last week my M60's as I need more to fill the room for music.
If your looking to keep costs down I would go with the M22 and upgrade the sub. For movies the sub is pretty important to me.
What do you have for a center channel speaker? From what I've heard 3 M22's up front is better if the space allows than 2 M22's and a vp100 or vp150. I didn't have the space so I went with the vp150.
