doesn't part 2 have all of the skins from part one with the exception of Shinin, Shake ya body, Lights and I hear music in my soul?
Those 4 are about the only skins not in part 2 and Lumines LIVE. That being said, you should still get part 1 if possible, because the backgrounds and effects were changed. The liscensed music wasn't that bad, maybe the black eye peas song, but that's it.