My favorite dubstep song is none of them, due too the fact that its just minor scale low blowing bass lines, over and over and over and over and over and over and over and over. And over.
Any Rusko, Flux Pavilion, Bar 9 and Chase and Status. They're all amazing. Check out stuff posted on UKFDubstep, always my fav. channel for music. Also search up remixes by not well known artists. You'll be surprised by what you find.