If the D2000 are anything like the D5000, they honestly sound better out an ipod & portable amp than all my other headphones (Grado SR225, Beyer DT770-80, Shure SRH840, AKG K271). (okay not as good as SE530, but those aren't headphones) But they still sound like dog snot bubbles compared to how they sound amped.
Not that I'm recommending them for the OP, because sound quality aside, they are not portable, rugged, isolating, inexpensive etc.