Stephen Costello, James Valenti, Piotr Beczala, and Michael Spyres.
The first three already have something of a reputation, but the last is no less talented.
Google them if you haven't heard the names. They will be the future...mark my words.
EDIT: There's also much talk of this Stas Vitart fellow, but I need to hear him sing somewhere besides his living room before I can be sure.