Oh I forgot to mention, there's this rapper from Boston, Sam Adams who released a mixtape, which is basically some freestyles over techno, club music and some rap/dubstep. It's not a deep or anything but it's awesome for parties. Anyways I can't link it because of the language but search Sam Adams Party Records on google for the free download (not pirating, it's just a mixtape).

I love Sammy. Him, Chris Webby and Mac Miller are all great.