There's quite a few options for closed headphones actually; I'd personally look at the Kenwood KH-K1000 right off the bat - you'll probably get a lot of suggestions for the Denon AH-D2000 as well. I think the Kenwood sounds better, but that's neither here nor there - what does matter somewhat more, the Kenwood isolate somewhat better. Others to consider would be a variety of Audio-Technica closed cans, and perhaps the Sony ZX1000 (I've heard neither here, but from reviews they should be fairly "balanced" compared to many closed cans that are quite bassy (like the PRO900)). 
 
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sluflyer06 said:

I also have a set of 580's that I've had for countless years now and I'm looking for an upgrade. However...my primary listening environment is now at work so I have no choice but to move to closed drivers as its very quiet in my office and the open drivers force everyone else to hear my music.  From searching for awhile now it seems like options are really limited in closed cup cans.

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