Again, great info and comments from everyone. Wow ihifi, 2 EP 500s!! I guess one EP600 won't be too much.

From what I'm hearing my multichannel music dvd's will definitely benefit from a brand new sub. I've been happy with my two channel sound with my pre-pro set to bypass, but multi-channel music was always lacking punch (or at least in my head). Hence, I've taken on a quest to improve my sound (i.e. make that bass drum reappear on concert dvd's).