My main concern is my speaker placement. I already know I cannot place the surrounds on the side. The surrounds are going to have to be mounted about 3’ behind the listening area about 8’ high and 12’ apart. They will be projecting out over the listening area. If I add a rear center, it will go in between those two rear surrounds I described. Will I still get any desired effect from a rear center, or should I just save my money and go with a 5.1 setup? Base answers on the assumption that this room and configuration will always be used. Don’t factor in the potential of moving the receiver to another room. P.S. Receivers I am looking at are the Yamaha RXV630 and Onkyo 600.