How much do you think I will get?

I am thinking of going to GAME and trading in the simpsons game (wii), juiced 2 (psp) and football manager 2007 handheld (psp). I am going to get medal of honor heroes 2 or pdc world darts championship 2008 for the wii. How much should I get for those 3 games and are the 2 i want good?