I own the SR80i, and I love them, and also own the SR325is, and them them because to me they are two very different headphones, and even though the 325's are heavier than the 80's I find them more comfortable. I've never heard the MS1, but people on this forum do speak very highly of them.
What aspects they are differents man?
now i'm getting confuse :( hahaha
But you cant headbang with 325is right?