i'm going to keep my onkyo receiver and i think i'm going to get the 755 model for the simple fact; if i want to upgrade my other channels with mono blocks sepratly it would cost more. the 755 comes with a hookup to hook more amps to it like the mono block 200. so if i want to go 7.1 i'll just get two of them. but i really would like to now what kind of taxes it well be. also if running 5 speakers at 200 and leaving the back surround at 125 well it be noticable.