Sony MDR-V600

Pros: Good high and low range, good audio, comfortable (moreso over the years), complete ear enclosure with room to spare, thick & hard-to-tangle cable, big and fat but not heavy, durable yet light construction, plastic but not cheap feeling.

Cons: The fake leather skinning over the cups and headband comes off after lots of use in a couple of years. I personally don't even think that warrants a complaint: "after years of heavy use, these phones showed signs of wear." V600's are workhorses.

Summary: I don't remember exactly when I picked these up, but it was some time (maybe close to a year) before Hurricane Katrina. Some supposedly nice Koss phones had fallen apart on me, and since I wear phones when doing voiceover work or audio and video editing, I had to get something that would get me some good sound without blowing my savings. I've had a lot of trouble with headphones physically breaking, so I looked for something with a solid build, and as always I wanted some big cups that cover the entire ear. While in a store in Baton Rouge, I looked over the decent selection but I kept coming back to the V600's. I bought them, and I swear by them.
If you're a businessperson who does a lot of traveling and you're looking for some phones for your iPod, these aren't what you're looking for. If you're looking for phones that will remain at a permanent location at home office, work office, A/V studio or dedicated to a gaming rig.
If the only headphones you've ever bought are buds or the little on-top-of-the-ear headsets that come with radios, you'll be introduced to the cult of a great set of over and around the ear cups. No noise canceling technology other than the big fat pillow of foam between your ear and the outside world.
They're straight forward, big, cushy, and they sound great after years of heavy use. Also, they don't seem to fall apart after lots of regular use. I used to average two sets of like-sized phones a year because the band would strip or a cup would snap off, but to this day, these particular MDR's are holding up remarkably well. These things don't leave my home studio, I'm considering a second set for my office as well.
Anyway, good stuff. Shine on you crazy diamonds.