So I own rock band and i have 2 guitars mic and drum set, and I love the game. I recently played Guitar Hero 3 on the wii and really enjoyed it...however i'm trying to justify buying Guitar Hero for my xbox (i don't own GH just Rockband) but I'm not sure I see the point if I already have Rockband...I need some reasons that GH would be a smart purchase and not amount to just more songs that couldn't be sung or drummed. So any help you can give would be great Thanks

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My Games
Battlefield:BC | Alone in the dark | Lost Odyssey | COD 4 | Ninja Gaiden 2 | Rock Band | UT3 | Halo 3
Games Pre-orderedMadden 09 | NCAA 09 | Force Unleashed | GOW2 | Fallout 3 | Fable 2 | Dead Space |