I'm hesitant to recommend the DT990. It's a very trebly headphone and very cold, and it could also play really bad with any possible badly mixed rap and metal records. DT880 is the safer bet. If there were any HE-400s of the world in the 200 dollar range, that'd be an easy recommendations, but sadly not many headphones carry that sound signature. Any headphone can have bass good enough for rap, as long as it extends naturally. EQ can take care of the rest, but if the headphone doesn't extend naturally, EQ won't do much.
Edited by TMRaven - 11/24/12 at 6:42pm