Do you have an Apple TV (2nd Generation)?
If you own an Apple TV (2nd Generation) with software 5.2 or earlier and want the new Apple TV (3rd Generation), sell it on eBay. They are going for over $200 if it's in good condition and comes with all the original components (box, cable, documentation, remote).
DO NOT update the software to 5.2.1!
AppleTV 2