Oonoki (For Obvious reasons)
Mei (Hot, and lava + acid breath is awesome)
Gaara/Ei (Gaaras very skilled, Ei isnt higher because he's too reckless and get angry easily,)
Tsunade (Yes, its cool that she can regenerate constantly, but think about it Oonoki can vaporize her and she cant heal from that, Mei can melt her and she cant heal from that, Gaara can crush her and maybe she can heal from that but w/ all that pressure that the sand can exert, she wont be able to move, and Ei has the speed factor on his side. Im not saying she sux of anything, but she's definitely at the bottom)
well onooki for sure is number 1, his techs and battle experince as basicly kept the kages alive.
2) A, right under onooki. A' with onooki techs are nasty to say the least. so he goes second.
3) Tsuande, Mei and Garra are in support roles and they are about on the same level in terms of battle contriutions
So I break them up into front lines;
Onooki with A,
And backlines;
Tsuade,Mei and Garra.
dude u cant put A under Mei, he maybe reakless but he has fough very well in the fight. They simply would have been able to attack without A and Onooki working togther liek that do.
1.raikage
2.onoki
3.garra
4.tsunade
5.Mei