well like already mention suigetsu is there to handle kisame.. and juugo is pretty much a powerhouse.. karin's abilities is unknown..
but i still didn't understand why sasuke would not recuit sakura or naruto.. since sakura would probably do everything for him and he saw her improvement in the hidden grass arc.. as for naruto well he could be a bait to lure itachi out..
1-"Four men, one goal: Hunt for Akatsuki"
2-"Winding Road: Our paths must meet"
3-"The Fastidious 4: Rise of the Silver Snake"
4-"Rebirth: I will live forever"
5-"The clan formally known as Uchiha"
6-"For the last time I'm not coming back!!"