Seems to be a subject well covered here but since every situation is different, I wanted to get some feedback on my particular set-up.

Currently I have a Denon 1801 70W perchannel, Sony DVD(not sure which model), M22tis as mains, Cerwin-vega LS6C ctr, Sony SAWM40 sub, and 2 Aiwas (old mains) as rears.

room is large 14x25-30long. Listening area 14x16.

Probably going w/the 150 as a ctr. But considering either M3s, M22s or QS4s as rears. Seems to be a lot of people going w/the M3s as rears to save money, but won't the different dynamics from the m22 to m3 make a big sound dif? And can the qs4s be mounted on the side walls since the is no rear wall to mount them on? Have been leaning towards the M22s any reason other than $$ not to go that way?

Also, will my receiver have enough power for the 150?

Thanks for the feedback!