I have 2 12" Polks in a custom enclosure when I'm rolling down Mill Ave. Yes, I do like my bass. But more importantly, I like my accuracy.
The KRK's don't force the low end (a good thing). I've been ABing them w/ Sennheiser HD380 Pro's and honestly, they are just surpassing them in every way w/ regard to tonal detail in the vocals. They don't have much soundstage and they don't exaggerate the bass...but this is a good thing. I left them on the tube for a few hours and things are toning down on the high end. The soundstage is opening up and the bass is hitting not harder, but more accurate even. I'm honestly blown away by this headphone and thinking I might stop here, return the 380's and just wait, research, etc before my next can. I have some AKG Q701's if I need the space, but I'm enjoying these more despite their closed, in your head presentation. KRK did a magnificent job w/ these, yet I yearn for the low end BOOM my RP6's delivered.
Unfortunately, I'm not sure there IS a headphone w/ such accuracy and comfort WITH low end quantity and the fun factor of these. At this point, my only real consideration is Grado. I own the 325i's and they're phenomenal, but my cat sort of had his way w/ them. :(