I have the five M80's and love the set up. Well auditionong the Parasounds, I had a chance to listen to the Verita i's, nice speakers, but for me, I prefer the forward sounds of the M80's.
I'm not going to try and recommend which speakers, as that depends on your ear. But I will support the idea of having all of the 5 floor standing speakers, took some doing to make it work for me, new cabinet, some porting of it, and a slide out shelf if its needed. But for me, it does not get any better than having all 5 speakers the same, just my opinion for whats it worth.
Good luck on what ever you choose, it will be worth the effort when its finished.