I agree with CIC. Rock Band is a hell of a lot better than Guitar Hero 3 will ever be. If you were to get a Guitar Hero game, it should be Guitar Hero 2 anyway. The new guys totally messed up Guitar Hero 3 in a lot of ways. For example, a lot of songs are designed to be more difficult than fun, sacrificing the fun factor for waves of notes and absurd difficulty levels. At the same time, the star power phrases are so long that if you can get them, chances are you don't need the help of star power to beat the song.
I know you've probably got the game already, but seriously, Rock Band is a hundred times better than Guitar Hero 3 will ever be. Yeah, it's more expensive, but most good things are more expensive than their inferior relatives.
On the other hand, anything is better than
Guitar Superstar...
