How Much Should I Sell My Nintendo Wii For?

Me and my sister got fed up with the nintendo wii so we are deciding to sell it my sisters friend offerd to buy it for £140 with all games, no thanks.
Anyway in store with one controller and one nunchuck with wii sports is £180 new.
So here are the items:
Wii console with all the cables
2 controllers and nunchucks
Deck like charger with 2 rechargeable batteries
Wii fit with the balance board
Super mario galaxy
Wii sports
Sim animals
My sims
Wii music
Super smash bros brawl
Mario party 8
Star wars the force unleashed

Thanks for all your help and support

Suggestion:

Ask her if she will take it for £30 or £40 more. Because she's paying a little price for a lot of games and supply's for the wii. Good luck!