Here to bump a dead thread just because I support Asian male singers : p To mind, I can only think of two that are U.S.-based (aside from The Slants, of course):
Daphne Loves Derby - this group is actually somewhat known now. At least known enough to have a pretty nice music video plastered with hot white chicks, which is pretty funny because everything about the video is white - except the asian singer!
Short Round - I think the singer is a Vietnamese dude. not sure if they played any shows outside or Nor Cal, but I know they were a bit more small-scale. To me, they are the definition of indie rock before indie rock became a mainstream phrase. They've disbanded, but the music is still worth a listen.
SO YEAH. Power to The Slants. Especially since they're going for the dark synth sound that is reminiscent of Depeche Mode.