Some reviews for the OP.
Here's some reviews on Denon A/V Receivers:
* Denon AVR-989 (same as the AVR-2809CI), which is last year model, and was replaced by the AVR-990.
->
http://www.soundandvisionmag.com/receivers/3100/denon-avr-989-av-receiver.html
))) You don't need that much receiver in your own system, this is just to illustrate the Denon quality.
* Denon AVR-2309CI (same as the AVR-889), which has been replaced by the newer model, the AVR-890.
->
http://www.hometheaterhifi.com/receivers/498-a-secrets-receiver-review.html
))) This is what you ask for; very nice indeed, and all you need and more (AVR-890).
* Finally, the Denon AVR-1909 (same as the AVR-789), being breplaced by the AVR-790.
->
http://www.hometheaterhifi.com/receivers/537-a-secrets-receiver-review.html
))) Again, all you really need in your own system, plus a savings of $220 (AVR-790)
_____________________________________
To make matters worst

, you can check at London Drugs for the Onkyo TX-SR-607, another dynamite receiver (see what price it is).
Or if you don't mind last year model (should be on sale), the Onkyo TX-SR706.
Or even the TX-SR606 (also on sale).
*** My take: In Canadian dollars, stick with one of these (enumerated here), and try to be between $500 to $800 maximum.
Your Polk speakers are fairly efficient, and with your 15" subwoofer, you'll be able to get by with any one of these, in your own system, and still have all the power you really need, and more...
There is no rush, TAKE YOUR TIME, and make the right choice.
Read all reviews, get informations about the features you really want, and go to the stores to get a hand on their remotes and GUI menu.
After all, you'll be with it for a while, am I right?
Hope this helps to expand your horizons, for making a wiser choice.
Cheers,
Bob