Not sure about the hard drive stuff, but I just bought a Z1 with Sirius, XM w/NavTraf, TV Tuner, Bluetooth, and iPod Modules for $500 from a guy on a Toyota Forum. Not sure you are getting the best deal, but who knows. Maybe this guy is just hard up for money?!
And before anyone says "Stolen!" - He has the original box and manual and all that Maybe he got it from the back of a Semi?! Lets hope not.
BTW - 1st post for me! Glad a great forum like this exists!
Greg