If you like cardio, Zumba, Just Dance 2 and The Michael Jackson experience are my personal favorites. If you have Redbox (movie rental machines) near you, they are now carrying wii games. For $2 you can rent the game and see if it works for you before spending the money to purchase. That is how I found both the Just Dance 2 and Michael Jackson. Rented them, loved them, bought them.
If you aren't familiar with Redbox, go to www.redbox.com. You can search to see if they have any near you.