Yeh water does as much as rest, i can get into top 10 easily if i spend coupons. I use Haku/Suigetsu/Guy. If you have Iruka, Guy would be the one to get replaced but Haku and Suigetsu are not Konoha, so it might have mixed results.

Mind you Haku is only worth using after he is 3 stars or higher, so if yours isn't go with Iruka/Tenten/Guy, then once you get him just test.