Waiting for my new avr525 7.1 receiver to arrive. I want to ask if there are enough 7.1 sources, i.e. dvds available to warrant the immediate purchase of two additional speakers, as well as the royal pain to run 2 additional speaker wires under my crawlspace(the real low, scrape on your belly part) then fish them up through the walls to their final resting place, or can I wait until 7.1 becomes more prevelent? In addition, if I operate in 7.1, that takes away the usage of the speakers on my deck without the purchase of an additional receiver. Thoughts?