I've only seen some Japanese Rock bands live in the US -
Psycho le Cemu, Camino (x2), Duel Jewel (x3), Dir en grey (x2), Kagrra,, Merry, miyavi, girugamesh, vidoll, MUCC, D'espairs Ray, alice nine., also got to see Yoshiki (X JAPAN/Violet UK) and Sugizo (Luna Sea) when they announced the formation of S.K.I.N. (Yoshiki, Sugizo, miyavi and Gackt's new band).
I feel very fortunate to have seen all of these bands here in the US. ^^