I like a good set of ear muffs and have had many, many sets over the years. My current 3 sets are, at the cheap end going up..
Sony fontopia MDR-EX71SL = inexpensive and decent sound, very comfortable. Cuts out a lot of noise due to their design and are ideal for lappy use.
Sennheiser HD580 = middling price, extremely nice open sound, very comfortable. Needs a lot of juice and a good soundcard to get the best of them. Works ok with plain lappy though.
Shure E5c = Ouch! expensive, and with custom earmolds even more so. Comfortable with the custom earmolds. Sounds sublime. Only use with a good soundcard as they sound crap with plain lappy output... just too damn revealing.
Wow, all 3 start with an 'S'.... spooky!
I also use a Echo Indigo pcmcia soundcard... excellent sound and power enough for all 3 headphone types.