Good stuff
I like how the instruments trip over each other JUUUUUUST rigth for it to sound perfect. Also, You don't drown EVERYTHING out with the (kick?) drum in the background. I think the choice of synths was pretty good because it provides a good contrast to the the bass that accompanies the drum.
I might suggest that this go to drum and bass though, not dubstep. It just seems like it would be better in that category.