Poker Face

I would not consider myself to be a big fan of Lady Gaga, but each time I hear her song "Poker Face" it seems to grow on me more. Most of my exposure to this song though is from others' interpretations of it. Those include versions from South Park and by Christopher Walken. Now, someone has combined these two videos together with the original Lady Gaga video, and they did a terrific job at it. There is just one problem though. Watching Eric Cartman performing the song makes me want to buy Rockband 2 or Band Hero for our Wii, but I do not know which one to get.