The Wii Fit has a ton of games & exercises, but I think it's still $100. The Just Dance game is a blast, but it's very tiring. Right now I'm borrowing my friend's Wheel of Fortune & I love this game! I like playing the board games on it a lot. I also love Wii Tennis-that was very addictive for me...even though I rarely win!
ETA: If you have any old Game Cube games you can play them on the Wii as well.