Hi,
as already said…I would recommend the Retrologue as well.
There are some really good tutorial videos on YouTube how to make Dubstep with Cubase.
Here is an older Cubase 6 Tutorial of JHP:
http://www.steinberg.net/en/support/tips_and_tricks/archive_2011/cubase_6_dubstep_beat_december_2011.html
Best regards,
Marcus