AUDIO TECHNICA W 1000 X... I take it you missed my quest for the CLOSED Dt 880!
Well here are some options
the Sound Magic REV 1 sounds close as well...
but honestly the w1000x sounds so much like the dt 880 out of a clean amp, that I almost sold my w1000x... and trust me dude... after mods and L3000 pads the w1000x have a very simmilar sound signiture! Only with the right amp [cuz the w1 she's a picky lady] does she gain her intimate magical closed gorgoues sexy sounding nature! The Hm801 makes a nice differeance for the w1000x. While the 880 out of the 801 is warm er... it lacks teh intmacy of the w1000x
BUT that said... the w1000x would be a good option. Pair it with a nice clean solid sate, or the HP 100 REV 1 [some time in 2012, as later revisions have more bass] are another great option. There is also the Shure 840, but that requires some modding to get close to the dt 880 osund as well
I'd recommend the hp 100 Rev 1 for a closed dt 880 sound without any modding. I liked them very much. A simmilar brigt sound with [smoother than the 880 mids] and more sub bass [but a smidge less mid bass]
That and they isolate like a mug

... isolation... is something the W1000x kinda do [they are much better than a open]