So I am wondering if the Arch. series would fit in my room and sound fairly decent. obviously the HT package of the 80-600 would be ideal, and are also huge and take up a lot of space. I read the other posts I could find on the Arch. series, but just wondering....my room is 15x28 and I plan on doing 7.1...any thoughts?

Why not consider one of the other floorstanding models? My room is bigger than your and the 60's work great. With a sub, I'm sure the W22's would be fine and perform similar to the M22's. Neither one will give you the same bass performance of the 50's, 60's, or 80's for a better blend of low sounds.