Thanks for your input jostenmeat
When I mentioned lag, it's not about audio not being synchronized with the image. It's both being delayed by the same amount.
This is something you will not notice in a movie.
The lag will only be a problem with games, the audio/video cannot be delayed or I'll always be one step behind. Imagine playing guitar hero or a FPS with delayed audio/video.
I would really appreciate if you could try a game or two just to check for delay. If you do notice delay, I wonder if turning off all video processing would fix it.
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I believe the 1800 and the 806 are good receivers that can give enough power to my RSs. They both cover my basic needs (power, HDMI inputs, latest HD codecs, pre-outs and multichannel inputs). The 805 would be my beast (really an animal) of choice, the amplifier section is really good for the money asked. It's hard to find a black one for a good price though.
The Onkyo 806 seems to have better EQ and bass management, that would let me tune the receiver + speakers for better room integration.
Audissey seems much better than the Yamaha's version.
A negative point for Onkyo is the firmware upgrades and factory "recalls" to fix some problems. If I get a Onkyo I will ask for a new unit for the factory, if possible. They seem to have corrected the problems.
The Yamaha, on the other hand, just seems to work without problems. I didn't found anyone complaining about anything.
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Video processing is not a requirement. I only use a Xbox 360, a HTPC and a HD-DVD player. All through HDMI.
I'll take a read at both manuals to see if there's any deal breaker about functionality and usability.