Hey Breed. Good find with the 606. I went to circuit city this weekend to see how their liquidation sale was going. Not bad deals even for them. Unfortunately the places near me had no more Kuro plasma screens.
Anyway with respect to the audyssey setup. I used it and really disliked what it did. The only thing I found it useful for was for measuring speaker distance from my listening position. I hated the EQ settings it set up. If you have one good eye and a tape measurer you can determine the distance yourself and input that data into the 606's setup menu. I can't speak for everybody but if it were me I wouldn't try to spend more money on it since it's not terribly useful. Save the money for some Aperion speakers!
Speakers: Aperion 6T's, 6C, 4B's, and 8D
Receivers: Onkyo 805 and Pioneer SX-1050
DVD player: Oppo 981HD
TT: Pioneer PL-71
Amp Selector: Niles DPS-1