[geoelectric]

Unless you fly or are muting HVAC or server room sounds, I haven't found that noise-cancelling headphones are superior to isolating (close-backed circumaurals or in-ear monitors). NC doesn't work well for voices, and the extra expense tends to put them into "I'm too paranoid to keep them on my desk" category.

I'd save the $$$ and just go for a nice pair of isolating ones.

I've also become a huge fan of wireless headphones for the added mobility--I switch between a few different computers and monitors, and not wrapping myself up in the wire is worth a slight hit in the sound.

Sony MDR-10RBTs are an excellent model for the price, hella light and comfortable, don't leak much sound out or in, and sound quite decent with Bluetooth AAC/AptX enabled (I listen to rock, metal, industrial, pop, dance, rap--can't speak much for classical, jazz, etc.)