I like Magnetic Man, though this with Katy B is what first made me listen to them
[yt]http://www.youtube.com/watch?v=M_ZftrTodU0[/yt]
About the best example of dubstep I can think of right now. It's not my favourite genre of music, as there are far too many annoying poorly produced tunes around, but like everywhere, there are a few good tunes in it.
Actually, these two, mainstream for the UK, but amazing nevertheless:
[yt]http://www.youtube.com/watch?v=K_2Z32qCYBg[/yt]
[yt]http://www.youtube.com/watch?v=hpTkZARu0pE[/yt]
Skrillex is a weird one, he's an underground producer with music that's unfriendly to the mainstream ear, becoming mainstream. Some of it ventures a little far to the crazy part for me. First Of The Year and Breakn A Sweat are incredible though.
Yes it blends with house and drum and bass now and then, but it fills the same niche, is arguably more up to date than those, it's the new boy of dance music, and it's enjoyable on a night out.