I've read some good things about the Pioneer VSX-1019AH-K. It seems like a good receiver with lots of features and a good GUI for the price.
AV Receiver Battlemodo: $600 or Bust
You want a serious home theater. One that will rattle the windows, and ensure movie night is always at your house. But you don't want to spend more than $600 on the thing that ties it together. Cuz you're smart.
Spending $500 to $600 will get you a receiver that will use a microphone to listen to itself, configuring and equalizing up to seven speakers and a subwoofer. It will switch between at least four HDMI sources and a lot more analog devices, and send everything off to the TV upconverted to HD resolution through a single HDMI cable. The feature sets of competing models are so similar that it can be tough to tell them apart, so I called in the four best in this price range—from Denon, Onkyo, Pioneer and Yamaha—to help you make your decision. As it turns out, the decision was easy.
Gizmodo
Pioneer Canada Product Link
Home Theater Magazine recommends it in their entry level A/V Receiver picks.
Best Buy sells them for $649.99.