I had MS Pro and RS1 for testing and i preferred slightly the first one, which I'll be ordering soon. D2000 beats them amped but unamped they both sound allot better IMO.
EDIT: forgot to include bottom line: MS Pro the best I've heard unamped, RS1 second, HFI-780 third, then D2000, then nine empty places, then HD595.
DOUBLE EDIT: as unamped i intended powered by DAP, not some good/more powerful source cos that's another story.