I have the Yamaha 5760 which I purchased recently. Seems that the biggest difference with the 58xx series is the addition of the XM sat. option. Compared to the old Technics I was using it's quite a step up in features and in sound. I'm loving it so far.
yamaha doesn't list this e-tailer on their website as authorized. Great price, if you're comfortable buying from an un-auth seller, and it's what you want I would say go for it.