I have a 2900, the model before the 2910. It kicks ass.
The audio in the 2900 will be better than the 2910. The equal (or slightly better) in regards to audio would be the 3910.
I've also heard that too. I will use it only for 2 channel listening for headphones. I think it only has bass management just in the DVD-A part but not the SACD part. Is bass managment an issue? Or is it just a thing for subwoofer and speakers and I don't have to worry about it?
The bass management is for both SACD and DVD-A. You can set it to 2ch priority for both formats, I believe it's only applied when using the analog outs. For SACD you can't output dig, so you'll have to use the analog out. Some SACD formats may not allow the channels to be mixed for 2ch, so the front to channels will take priority. It's easy to set, you have a button on the front of the unit for multi/stereo, some other players you'd have to go through the menus to change the setting (not easy if it's only hooked up for audio).
It's a tough decision when you're buying a multi-format player, so many variables to consider. I bought mine with 2ch in mind, it might/might not be the best choice for the $ (don't have the cash to try all the others) but I'm happy with it so far.