Baboon guy, the Beyers have ample bass but its not overwhelming. Just right and very tuneful I'd say. And IMO, the DT531 is a bit better than even the CD3000 for trance, because of its better bass and more forgiving / groovy manner.
I've owned the following phones and this is what I thought of them (90% of my listening is trance BTW).
Beyer DT931 - Very bright, dynamic, fast, but fatiguing.
Beyer DT770 - Very bassy, sounds muddy and slow
Beyer DT880 - Nice soundstage, not groovy enough, weak bass impact
AKG K271 - Not good enough at all IMO
AKG K240S - Same as K271, but maybe slightly better. Too slow to be a trance headphone
Sony MDR-CD3000 - Very good, soundstage excellent, but coloured and totally brutally unforgiving, bass is slightly too weak.
Sennheiser HD650 - Too dark and slow for my tastes. Plenty of bass though.
Sennheiser HD580 - Quite good, but can be harsh in the treble, too slow.
Grado SR80 - Too uncomfortable, little soundstage, fatiguing
Beyer DT531 - Best yet, groovy, quite bassy but not over the top, good soundstage, best comfort and most forgiving. Magic with the right amp, inexpensive, flexible enough to cope with all genres.
Sony MDR-CD1700 - Like the CD3000 but warmer and more veiled.
Beyer DT990 - Better than the 770, but sounds fake.