Hello, I am looking for a DVD Burner for the 15" MBPr. I am interested in opinions of those users who did not buy the USB SuperDrive . In particular: * A DVD drive that costs less than the USB SuperDrive * A DVD drive that does not require an external power source * A DVD drive who does not require a second USB power source. Does such a thing exist? Or is Apple's burner the only way to go? I looked on Newegg, and for the few models out there that are cheaper, most reviews indicate that it uses a second USB power source. That's kind of annoying since the USB ports on the MBPr are on opposite sides of the case.