Basshead here also. Dubstep, D&B, 2-step, brostep
I liked the bass on my D5000 and D7000. Good punch, but not clean (flabby) on deep "wobbly" bass in the drops.
Sold them and bought Audio Technica ATH-M50S and then ATH-PRO700MK2. Both of these were bass-bombs! Great, deep, bass with a lot of extension (Power) and I thought I had a real winner, and I did for BASS!.
I got tired of them though when listening for extended hours. Tight clamping, not too smooth on the highs, just kind of wore me down.
Bought Audeze LCD-2s with full balanced setup (Violectric V800 DAC and V181 Amp) and I was loving life again. Good deep bass, not as intense as the ATH brothers, but solid punch, and mids and highs I could listen to all day (and I do as I am a programmer).
BUT....The LCD2s are open phones and within a day, I started getting dirty looks from people outside my office as I rocked out in my own little bliss.
So, I put dynamat extreme on the inside of the grills (I have a post on here about how to do that) and I sealed them and made them closed back phones.
Now the LCDs can get extremely loud. Like 140dB loud at 14Watts. But even at levels that others think are going to make them deaf, these babies just sound sweet to me. They do not distort on big drops and wobbly bass. They hold tight and just power through the music with energy that gets both my legs pumping at my desk as I sit for hours listening and working.
Now; I heard that the LCD3s take the extended bass and punch even deeper and tighter, and I have my LCD2s for sale on the forum here:
http://www.head-fi.org/t/623931/lcd-2-rev2-with-norse-audio-4-conductor-balanced-and-dynamat-closed-back-mod and not too brag, but these modded LCD2s cost me $1,200 between cable and phones and $900 is a great price to listen to what I would call the best bass (until I get the LCD3s).
If the price is too high, the ATH-PRO700MK2 were my second favorites and I also like the bass on my little Sennheiser HD25 MK II (I got the Addidas special with the blue treatment). Really nice bass for on-ear phones.