Twigge - Menace (Dubstep/Hip-hop?)

[Twigge]

I have been working on this tune for ages now, messing around with the layout and blending in the heavier sound towards the end.
Im still learning how to structure my tunes properly and everything else really.
Personally i am happy with this tune up to now but i know its shite compared to what professional producers are putting out there.

I dont have a set of monitors to check it out properly and i made it using a standard set of bass headphones
If anybody has a decent set of headphones or monitors could you just let me know how this sounds to you? And what i need to change or improve.

Cheers

http://soundcloud.com/twigge/menace

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[Twigge]

Any feedback at all would help me out a lot
I know its pretty shit compared to what professional producers are putting out, but i can take the criticism