Well I can vouch for HD439 (I have the HD438). Not only does it sound great out of the box, but when EQ'ed its in fact more enjoyable to listen than some much more expensive headphones. Extremely balanced sound, great opened sound, they actually sound more airy and opened than many opened headphones, great detail, particularly sparkly highs. And it is by far the most comfortable headphone I've ever tried, and I've tried a lot of them. Basically, there are comfortable headphones, then there's a big gap, and there's the HD4x9 or HD4x8 series. They make the HD558's or HD650's feel like torture devices. They're just so perfectly sculpted, not too big, not to small, with plenty of room for big ears, with virtually no clamping force, and they feel as light as wearing a hat. Truly the only headphones you forget you have on your head. People often say that, and don't really mean it. I REALLY mean it.