So I recorded this original song about 6 months ago. I want to re record the vocals sometime (and remix, new lyrics too...). Any suggestions on how to get my voice more 'aggressive' sounding (think trent reznor). Any help would be appreciated. Thanks. (also song was recorded with mac built in mic).

I like your voice. Actually, you sound a lot like Chino Moreno. The lyrics aren't very intelligible but they sound good that way. As for the aggressiveness thing, I can't really help you, I sort of have that problem myself. The current style does fit the song well, but it's up to you.
I think this suits the song. And if I may, I think you should ease up on the echo because the lyrics are intelligible. Over all the song is nice. Noisy but nice