I am new to the cinema av world and I have a couple of problems if somebody could help point me in the right direction. 1. I am looking to purchase the RX Z7 or the RXV 3900 but cant put my finger on what i am getting for the extra money. 2 I would like to find out if it is possible to stream HD movie content through the receiver to my tv and how this could be done. 3. I am thinking of running the B & W 685 home theatre kit through it would this be suitable.