How much money should I sell my ps3 60gb on Ebay for?

I want to sell my ps3 60 gb. I want to sell my 60 gb to get the 80 gb. The 80gb comes with Metal Gear Solid 4, the new dualshock 3 controller and it’s only $499! The ps3 60 gb was $599 with no bundle. So how much should I sell my 60 gb for.