Whatever you do, DON'T get the KRK for it's bass. It's so much lighter in bass than the HD-600 and DT-990 that they shouldn't even be mentioned in the same sentence 
There's a chance KRK made me changes, but I highly doubt it. They sound so good to me that it makes me not really care. They're not VERY bass light and just at the point where I'd consider them bass light. The clarity and detail is some of the best I've heard, but I've yet to hear a headphone over $600. Sometimes it likes to hide the fact that it has bass and it's usually very well controlled when it does show up.
For what you're looking for I highly suggest the DJ100 you mentioned. I absolutely love that headphone but it needs a $25 E5 amp at the bare minimum and it's totally worth it. Most will not really be impressed by them until it's amped. They have quite a lot of bass, some slightly forward mids and slightly rolled off highs. They're actually a little brighter than my HD-600, HD-598, but not my new HD-650 believe it or not.
I love them for basically any type of music, especially stuff like Pearl Jam, Radiohead and even female vocals like in Jpop/Cantopop. I think it's my favorite closed headphone for female vocals. It's signature has many similarities to the HD-650, but with more forward mids and slightly less bass. The clarity of the DJ100 isn't as good as the KRK, but close. It has more detail than the V6 and AKG K240, but it's definitely not anything near being a studio monitor, but still has a balanced sound that does still make music a bit more fun to listen to. Oh yeah and it's only $80! If I had to pick between the DJ100 and KRK it'd be the DJ100. KRK does a few things better though. It's far, far better than the Sextett and SRH-840 to me. SRH-840 was my old #1 favorite until the KRK and DJ100 came around.
I did a comparison recently of the Sextett, MDR-V6, DJ100 and KRK KNS-8400. KNS-8400 came out on top in many areas. Mostly in the area of detail and clarity.
BTW hopefully a review of the KNS-6400 shows up soon. Sounds like it has some forward sounding mids, but maybe not. Hopefully it has the clarity and detail of the 8400.
Quote:
Originally Posted by
putente 
Hi.
Just found this thread, because I'm looking for a pair of closed cans for my collection, than can give me something that the current ones I own don't. Both my HD600 and DT990 are very detailed, but I'm missing some bass on them. It's not that I consider myself as a bass-head, but I really do miss some more punch in the low-end (at least, sometimes)...