Never heard Justice's remixes but they have good songs of their own!
Slim Thug - Thug
Have some music produced by Adrian von Ziegler, it's really quite good, if you're into dark music anyhow.
"Then we have found, as it seems, that the many beliefs of the many about what's fair and about the other things roll around somewhere between not-being and being purely and simply." - Plato: Republic
If you haven't seen this, it's been around the internet a while. A really emotional combination of a wonderful song and a powerful animation.
The Algorithm - Panic
I love the combination of styles in these guy's music.