After getting the Signature Pro I'm contemplating the Sig DJ... walking through this thread it seems to be a nice fun-voiced headphone that does not loose itself in effects but provides good detail and overall sound quality -- might be a nice addition as I understand it as some kind of advanced M-100, which I like very much but has a too recessed midrange and too strong bass to use at home.
Regarding the above discussion of different takes on bass I may add my 2cent coming from many years working as a sound engineer. In short: for high-BPM genres like hardstyle we bring in the 15" horn-loaded bass systems, often applying a high pass filter that starts above 45Hz: deep bass does not come with 160BPM, the bass-kick is the thing (thats normally referred to as impact).
House-people like their bass deep, rather voluminous and enveloping, but it must still be clear and structured ->18" bass, maybe horn-loaded, and possibly some Infras for good measure. Low-Cut at 30Hz or below. Never ever use a band-pass, its an impulse mess.
Rap and R'n'B on the other hand *love* this things (i.e. band-pass) as bass hits on 1 (not 1-4 as in house) and is expected to vibrate for 2-4. Thats the only thing the paper-experiment above may provide some insight in.
There are of course many genres that fall somewhere in between and the most versatile setup is the one described in the house-section above -- which we therefore use most often. It corresponds to a headphone thats not genre-specific but has the capabilities needed by modern music (i.e. lots of energy down low). You can enjoy R'n'B on that system, but house on a R'n'B-specific system does not make a lot of sense.
So, to sum up: Bass is not the same as Bass, most genres of modern music have their own take on that. So I think you were not talking about the same thing above. The HD25 is to me a good example of kick-bass but no deep bass (which, in part, was a reason to sell it), the DT1350 is much more even, reaching down real low, while not emphasizing the kick part (which I would in frequency locate at around 80-150Hz).
I think I'll have to take a deeper look at the Sig DJ as it might provide a nice combination of kick and deep bass while retaining good resolution and imaging -- quite a feat actually. I dislike too much kick (i.e. upper bass)... lets see.