I'm looking at two different HU's right now. the kenwood excelon KDC-x493 and the KDC-x693. on the website i want to buy them from theres only a $15 difference, so price isnt an issue.
the x493 has a front usb port with the cd slot visible and the x693 has a rear usb port with a flip down face plate which reveals the cd slot. the x693 seems better, but the only thing keeping me from buying it is the rear usb port. the front usb port seems so much easier to use.