get mario galaxy(really fun,amazing graphics,and the levels are just awesome! or super smash bros brawl(replay value like no other game, really fun with friends,again amazing detai/graphics youll have a "smashing time" =P pun intended)
Metroid Prime 3 is a rock solid effort from Retro Studios. It has the best controls out of any game in the series and some very clever puzzles. Twilight Princess is also a masterpiece, its very hard for me to pick between these two gems.