I am starting the price at 4.0btc (about 40usd where the game is 50usd)
Just a friendly note, at least a week or so ago, there were so many Dirt3 codes rolling around that they were down around 1BTC ($14~17). Dirt3 is being given away with all kinds of ATI cards, so selling for Bitcoin is really the wrong audience... maybe try craigslist or some other non-BTC forum, where they're not swimming in them?
HTH, and free bump.