Onkyo TXSR605B vs TXSR606B

[BBCAN]

Hi all, I am in the market for a Home Theater Receiver and I was looking at the Onkyo Line. I was originally considering the TXSR605B and then noted there was a TXSR606B and it was cheaper, by $100 or so. I am in Canada and was looking at some online pricing and I was hoping someone could shead some light on which is better and if the $100 difference is justified, or if both are equal receivers.

Normally the higher moder #'s indicate a newer moder, so I am questioning why the newer model would be cheaper.

Please provide info, as well as preferences..... I am set on purchasing something this year and I wanted to be sure I spent my money well.

Thanks
B