NejiThe DT1990s have much more sub-bass than the less expensive models do; the output is flat down to 10 Hz according to some tests (and my ears)! I got mine from an authorized dealer for $400, but even at the typical retail of $600, they're worth it if you need to reproduce all the bass line in a recording. And they come with two detachable cables (straight/coiled) with 1/4" adapters, two sets of pads (for more, or less, bass), and a hard-shell case.
I enjoy my 880 Premiums also, but they don't quite hack it for critical editing and reproduction.
Yes, all Beyers are bright toward the top, but they're also time-tested designs and built like tanks.