Just FYI: *none* of the "noise reduction" you're describing in any of those headphones is electronic. None whatsoever. All of it is in the design of the headphones, produced by sound isolation. There are what are called "active" noise canceling headphones, but they require separate batteries, and the noise canceling circuits reduce the sound quality.

I'm also not sure why you chose to pick up the HD 380 Pro for personal listening; that isn't really what the model is for. It's intended to facilitate studio monitoring, which has different needs (reproductive accuracy versus personal enjoyment) from home hi-fi headphones. And Sennheiser makes so many of the other kind! The HD 5x5 series, the HD580, 600, 650, 800. All great products. And of course, for sound isolation there's the brilliant HD25-1 (so good for dealing with plane rides they used to give 'em away to Concord passengers).