Best contemporary soul/R'n'B diva?

I love coming across new soul divas, one of those exceptional women with a voice that goes on forever, pouring out fire, soul and tenderness with feminine strength and outrageous technical mastery… Alicia Keys, Oleta Adams… that kind of thing. Of the contemporary crowd, who’s the best? Which new voice I haven’t heard yet is going to get tingles rushing up and down my spine? Suggestions, recommendations, ideas… all welcome.