I was talked into upgrading my 04 base Escalade's radio from the regular cassette CD type radio to a touchscreen Nav radio from OEM-GM-Radios on eBay. My radio was toast. They seem to have a good reputation; however, I don't know whether I made the right decision with this radio even though I haven't received it yet. They are supposedly "New Other" on the listing, which I am assuming is rebuilt. I am hoping that the radio has its original programming in it, so I can upgrade to a 2012 Nav program, which is the latest for these. They come without a Nav disk. Does any one know about these? If so, can I buy an upgrade disk or do I need to find an original OEM programming disk that comes with this type radio from 2004. I'm think the later will be very hard to find, and I'm not sure which of these programming disks I need to buy. Any help with this would be appreciated.