Purchase at your own risk. Onkyo receivers are crap for reliability. All you have to do is look at the reviews. Onkyo is the LAST brand of receiver I would purchase.
Here's my review: I've owned 2 in the last 7 years and they are both running just as well as they did the day I bought them. (And, they were perfect the day I got them). I have the 509 and couldn't be happier with the feature set, performance and value.