How much should I sell my 80 gb PS3 for?

im selling it to get the xbox slim. it comes with 2 wireless controllers,2 wireless microphones call of duty 4, world at war, modern warfare 2, and black ops, madden 9,10, 11, burnout paradise, need for speed hot pursuit, mercenaries 2, star wars force unleashed, NASCAR 09 and midnight club LA. they all work and the system is not backwards compatible.