I used Ukon/Sakon, GNW Kiba, and Sasuke. But your current team is pretty solid for now, so * with that until you get better characters. Then you could do something like Sasuke, Kimimaro, Jugo.

That said, I'd also recommend that you get the Sound Four for utility reasons - or at least Kidomaru, Ukon Sakon, and Tayuya. Tayuya is really good for Strong Approaching, Kidomaru's pretty solid in Arena and Ranked, and Ukon Sakon is my current go-to DPS.