And I just saw aroch's link https://news.ycombinator.com/item?id=7685820
And I just saw aroch's link https://news.ycombinator.com/item?id=7685820
In particular, they make the MDR-7506 look bloated in the lows and weak in the mids and highs; I once compared the two headphones with a Karajan/Berlin Philharmonic recording of Tchaikovsky's overture '1812', and it wasn't even a contest -- the 7506 rendered the final crescendo so badly, with the cannon fire so thoroughly overwhelming the entire rest of the orchestra, that I couldn't even stand to listen to all of it.
As with almost all Sennheiser products, the HD558s are as neutral as possible (modulo the odd bit of foam, so I gather), and that's not for everyone; I listen mostly to music from the common practice era, so neutrality suits me well, but more modern music probably wants a more forgiving headphone -- listen to new pop masters in a set of "warts and all" cans, and you're going to hear a lot of warts. In any case, if you can make the opportunity to try out the HD558s before you make your choice, I think it's well worth your while so to do.
I tried the HD700 in the store and it was unbelievable. But I'm not paying that much for headphones.
You might be able to find a V-Moda M80 around that price too
Head-Fi has excellent recommendations for all types of headphones (IEMs, closed, etc) at different price points.
http://www.amazon.com/dp/B000CMS0XU/ref=pe_175190_21431760_M...
They're great as long as you don't mind them being bright purple.