There are tons that I could name but I'll limit it to one.
Trespassers William
This is along the lines of Bearman's Elliott Smith post, of which I agree. Those who know them, love them, especially Anna Lynne Williams. Others seem to not even know they exist. Anna Lynne has probably the cleanest and most beautiful voice in modern Rock (in its broadest sense). Any kind of doctoring in the studio or effects only harm those gorgeous vocals. She sounds just as perfect live as recorded. On top of that, the whole band do their part to enhance the music as a whole. They aren't just her backup band.
For the newbies, check out their second album called Different Stars. Very accessible to the masses and just plain good listening.