I am looking for opinions to help me decide on my theaters setup. I am building a theater with two rows. The first row will have the side surrounds to its side. however the back row will have the side surrounds in front of it. So I am adding to rear surrounds behind the back row on the rear wall to improve envelopment for listeners in that back row. What 7.1 dsp will give all listeners the best effect. I currently have a Denon-AVR4800 and will upgrade if needed. Ultra2 Cinema mode, Logic7, Denon Widescreen 7.1 Mode?