One thought about a new receiver would be to get away from the box stores such as Circuit City and Best Buy. Go to specialty stores and listen to other receivers such as Marantz, Denon, NAD, Pioneer Elite etc. Circuit City does have H/K which are good too. For $600, you should be able to find a pretty good receiver. Look at Marantz 5400, Denon 2805, Yamaha 1400, Pioneer Elite VSX-53TX, NAD T743 or an H/K 7200 (if you go up a bit) or H/K 430. There certainly can be others (some like Onkyo too) but you owe it to yourself to try other brands out of the Sony mold and listen to speakers other than the Polks models in the box stores.