I am also looking at M80s vs. LP2s. I would love the bass from the LP2s, but I'm also worried about the bass being too much for when I listen to Jazz.
I'm also worried that I wouldn't enjoy Hip Hop and Techno/Trance/House as much with the M80s.
I love the quantity of bass in the Beats Studios.
My only other minor problem with the LP2s is that they don't look as good as the M80s and only come in the boring black color.