I am buying a new TV (Panasonic plasma TCP55VT60). I already have about an 8 year old Denon AVR1707 receiver that I am using with my current TV/surround system. I don't know much about receivers and would like to know whether I should purchase a new one with the new TV. If so, what features should I look for? If there is a thread that discusses this, I'd be happy to have it pointed out. Thanks.