I ordered the following DAC/amp for the office and I may use it at home some also. I ordered the fully upgraded version (I got in on a group buy- the fully upgraded version for a little less than the standard unit).
http://www.hippohifi.com/products/bloat/bloat.html.
I wanted to keep the cost of my entire setup to no more than $300. I've spent a shade less than $200 on the DAC/amp- which leaves me with ~$100 for cans. I have it narrowed down to 4 and I need some help from there.
Grado SR80, Senn HD280, and the AKG K141S or K240S.
I listen to a broad range of music, but more folk/acoustic than anything (Ray LaMontagne, Alexi Murdoch, Donovan Frakenritter, etc..). I like crisp/bright sound, within reason. I would like to keep the sound outside of the phone down to a reasonable level- I would like to be able to turn the volume up a little, but not bother those around me at work. I am leaning towards one of the AKG cans- a good compromist between a full open and an enclosed can- not to mention good reviews.