It's going for $398 at harmanaudio.com, which is their official refurb site, so it's totally covered. I've had this receiver for 2 years and it's great. It has DPLII, DTS-ES Discrete and Logic 7, but does not have DD-EX.
Please note - while it's called a 7.1, it only has 5 amps. You'll need a separate amp to power those rear channels. The AVR-525, which does have 7 amps, shows up frequently on the harmanaudio.com site. A bit more than the 520, but not much. I'm pretty sure it was < $500 the last time I saw it.
