How much should I sell my Xbox 360 for?

I have an Xbox 360 elite (I know its the last model they made)250 gig with kinect turtle beach X12 headset 1 controller and loads of games:GTA 5 COD AW fruit ninja kinect Minecraft south park tsot splinter cell blacklist Terraria dragon age inqusistion battlefield 4 multi player (campaign freezez at 2nd mission but you can still download needed content) skyrim tomb raider kinect sports batman arkam city goat Sim ac 4 watch dogs fallout 3 the walking dead portal 2 far cry 4 halo 4 just cause 2 and NFL 11 how much is that worth.

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