I don't know where your at but Staind gets a ton of radio play here. Also I wouldn't consider them nu-metal after "Break The Cycle" although I haven't heard the new album.
As for above guy, Papa Roach had like one or two nu-metal albums, so they aren't a good argument and went away from nu-metal along time ago. I thought Trapt moved away from nu-metal after there horrible album that had "Stand Up" on it. Last I heard they were making less than mediocre hard rock/post-grunge. Hollywood Undead? I thought they were a one hit wonder (if that)...although Danny Lohner did some work with them recently I still wouldn't give them a listen.
I'd say nu-metal bands that retained their commercial success was Korn, Staind, Disturbed, and Evanescence.
Although almost everyone who was around for HT and Meteroa remember Linkin Park (for better or worse).