Well The onkyo TX-NR906, as most of you already know, has been replaced by the TX-NR5007.
You can have a look here, but you need your Google toolbar 'Translation' feature for this.
It is loaded with the latest, including Audyssey DSX, for Height & Width channels, and Dolby Volume too.
There are five TI B-B PCM-1795a Dacs in it (32-bit/192khz), for a total 9.1-channel system.
* Onkyo TX-NR5007 Look ->
http://www.areadvd.de/hardware/2009/onkyo_txnr5007.shtml
And the closest Denon model that can be directly compared to it, is the Denon AVR-4810CI,
also carrying Audyssey DSX; but here with the capability to run Height and Width channels at the same time,
as opposed to the Onkyo model, which you can only run the Height (with Back Surrounds),
or Width (with also the Back Surrounds), both not both Height and Width speakers together.
There are six TI B-B PCM-1791a Dacs in it (24-bit/192khz), for a total 9.3-channel system.
And count them, there are fifteen set of speaker's binding posts!

* Denon AVR-4810CI Review ->
http://www.areadvd.de/hardware/2009/denon_avr4810.shtml
The best street price for the Onkyo TX-NR5007 is $1,599 USA, maybe less for an open box.
The 5007 weights 55.1 lbs (25.0 kg) net, and power consumption is rated at 12.8 A.
And the best price for the Denon AVR-4810CI is $2,199 USA.
The 4810 weights 42.1 lbs (19.1 kg) net, and power consumption is rated at 9.5 A.
The Denon AVR-3310CI and the AVR-4310CI are simply not in the same league.
They are very light weight compared to the two above, with 28.4 lbs (12.9 kg) & 34.8 lbs (15.8 kg) respectively,
and with a power consumption rating of 7.0 A & 8.1 A also respectively.
))) Personally, I would pick the Onkyo TX-NR5007, but that's just me. :bigsmile:
And to even greater savings, the Onkyo TX-NR906 would be an absolute and tremendous bargain,
for around $999 USA street. And my Onkyo TX-SR876 is now only $799 USA, and brand new too!