Though one this, because I do believe the KEF centre speaker handles the dialogue better than the M1, but I love the look of the M1's, I've owned both packages by the way.
The M1's with ASW610, rather than the 608 would probably be my choice, but I beileve the 610 is hard to get hold of.
I would suggest you have a listen to both and make your mind up which sounds best, good choice in AVR it's fantastic BTW, the new KEF T range might be worth looking into if your budget allows too.