The Denon AVR-2105 is a great choice. You might want to spend a few more bucks and get the Denon AVR-2805. Check the power, inputs (2 coax instead of 1 may be important)etc on their website. The 2805 has a learning remote that might be more useful in your home theater setup. It never hurts to have more input and outputs than you need right now. Who knows what we will need to hook up 2 years from now? These receivers are so similar that either is a great choice. I do not think the Onkyo is in the same class as these receivers.
I am looking for a new receiver and am considering either the Onkyo or denon. If anyone has compared the two,I would like to get your opinion as to which one you would recommend?