So far as adding/changing amplifiers you would have to double your power to even have the system sound like it gets louder, so in your case you need to look at 600W or more @4ohm amps and even then it is only a few dbs louder; not really worth the dollars spent IMO. When/if your present amp breaks down this would be the time to upgrade.

FYI, the VP160, IMO, isn't really a downgrade, it has a different configuration that gives you better off axis listening, so if oyu are going to have seats that are outside of the front main positions you might want to consider the VP160.

So far as the avr goes I would look for the features you want and go with it, the amp power doesn't matter for you as you are strictly using it as a pre/pro. I really liked the feature set on the Onkyo 818, recently on sale around Calgary for under $900. It has Audyssey XT32(cheapest price point for this I believe), networking ability etc. The amps inside this unit are no slouch either.

Last edited by jakewash; 01/12/13 05:47 AM. Reason: added
Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70