I'm looking to get a new receiver in the 'as far below $500 as possible' price range. My current main speaker configuration is Polk Audio RTi4's in both front and back with a PSW10 sub. I'd like it to have DD5.1 and, if possible, DTS. I'm interested hooking up speakers from two rooms to it so that I can watch a DVD in one room and listen to a different CD in another. I believe this is called a multi-room setup, is that correct? Is it possible to get a multi-room system in my price range? Is it possible to get models from previous years at discounts? Would there be any problems getting a used one off eBay? What brands/models would work for me? Thanks for the assistance!