Is the only thing separating a 360core with a 360pro is the 20GB hard drive? If that is true then if I were to go on eBay and buy a core and separately buy a 20GB hard drive for it. Would it be the same as the 360pro?
No, the Premium also has the chromed out disc tray and it comes with component cables, a wireless controller, and a headset for xbox live. The core console doesnt.