1) Obito/Kakashi - Kamui, which can be used on both other items and the user's self. One of the most powerful/useful abilities in the manga.
2) Shisui - Pretty much the same as Obito's MS, but with WAY more restrictions.
3) Itachi - The only reason Itachi's MS alone is better than Sasuke's are the items which his Susano'o possesses.
4) Sasuke - Amaterasu, power to manipulate this flame, and a ranged-attacking Susano'o. If it weren't for the equipment Itachi's Susano'o possesses, Sasuke's would far out-class Itachi's.
5) Madara - Some form of Genjutsu (probably Tsukuyomi or something similar) and Susano'o (Perfect Susano'o is obtained via Rinnegan, which is a combination of EMS and Hashirama cells; you can't include Perfect Susano'o in your description of Madara's MS).
6) Izuna - This is only because we have yet to see any of his abilities. Personally, I think his sharingan is at least half of the power which Madara wields in his eyes (minus Rinnegan-related techniques), as it was their eyes put together. This would put Izuna on par with his brother, but as I said, we don't know for sure.