I'm looking to add a relatively inexpensive ($300-600)external amplifier to the Harman Kardon AVR 520 I recently purchased to power my PSB 9C and 6Ts (150W into 6 ohms for the 6T and 8 ohms for the 9C). Has anyone else used the preouts on their HT receivers to add an external amp? What have you used and how do you like the results? I was thinking about the bridgeable Rotel 976 (or 1066) to power my front 3. Any other suggestions? One other thing; has anyone ever heard of using your HT receiver's front speaker internal amps to drive rear surrounds (when you have an external amp supplying the front 3)? I've heard folks talk about this and was wondering if anyone has tried it. Thanks everyone!