Have a good condition Nokia N73 on O2 - it's about 3 months old - has a few marks but in general very good condition. Its boxed and comes with the usual.
I'd like to swap it for your good condition Sat Nav - ideally TomTom or one that tells you where petrol stations / car parks are. Will need a suction mount (but I assume this won't be a problem as they all come with them!).
I have 100% ebay feedback, a confirmed paypal account and feedback here at HUKDs! :-)