How much is an xbox 360 slim second-hand? australia?

this applies really to only Australian residents. i've had an xbox 360 slim 250gb for almost a month now, and don't play it nearly as much as i thought i would, and i want to sell it. i want to sell: console base bundle (ie, console, controller, basic cables and headset), halo reach, assassins creed, another controller and an hdmi cable. this all retails at $635, (if all bought at jb hi-fi, so fairly good prices). i was wondering how much i could sell this second hand? let me know what you would be willing to pay, or what you have heard would be a rough pricing. thanks