Just wondering if this is a good option. I am not going to go 7.1 because it is not practical in the room, and I would need to get a new receiver to do it, and I really dont want to give up the reciever I have. I also get a major discount on everything where I work, but we of course only sell bookshelf speaker as pairs. So if I dont go the center channel rear route, I will end up with an extra useless speaker. All of the speaker would be matched. basically what I would end up with is Infinty Primus 160s for mains, 150s ofr left and right surounds, and c25 center channels for the front and back. Is there any good reason not to do it this way?