How Much Should I Sell My Xbox For?

I have an Xbox with one controller and 12 games. Nine out of 12 of those games are old football games from NFL 2k2, Madden 2003, to NFL 2k4 to Madden 07. Then I have two other sports games and Sims Bustin Out. Anyway, I would like to sell it for $60.00 at least. Is that too much?