I have the Pioneer SE-MJ71 steel wheel series headphones. I've used Pioneer headphones for a long time as a DJ, they have excellent response and range and for daily wear work perfectly. One thing I have noticed is that when I am wearing them while working that you need to pump very little volume into them (slide the volume slider all the way down) to get large and expressive sound. I've thought about getting an external volume control in line with the 3.5mm to be able to control it even better.
At home I also have an older Sennheiser headset that I don't use nearly as much anymore because the foam has deteriorated so bad that the plastic casing is pressing into my head when I have them on (which frankly is uncomfortable). I've wanted to get a replacement for a while. The one thing I absolutely love about the Sennheiser cans is that they came with a REALLY long headphone wire, and can be unplugged from the headphones and from the computer (So when I've accidentally stepped on the cord or spin around in my chair I don't send stuff flying!). They have gone through years of use, I've had them since I was 12... I am now 25. If I could get new foam pads for it I would do so in a heartbeat.