Sky box

My god dam sky box keeps messing up and I am starting to want to upgrade to the High definition box from the sky plus box, so I am going to bid on a few on eBay to see if I can bag myself a bargain, obviously I am going to sell my old box on there as sky have told me its fine and its my card that is messing up so they are sending me a new one and because I have the impetus to get a high def box it will be good timing and hopefully I can save some money by bidding through eBay. Wish me luck!