Upgrading From My Audio-Technica ATH-M50s. Help!

Hey,

I got a pair of Audio Technica ATH-M50s a year ago and they've rocked my world.

Before then, I only listened to music on your average $20 headphones.

But these headphones brought my listening experience to a whole new level.

Now that my budget's increased - I'd like to add on a second pair of headphones.

Maybe even a little upgrade.

Here's my list of things I like - I'd appreciate it if you could share your experience, and help me out:

* Gotta be closed back - I take my ATH-M50s with me, and I don't want to be "that guy" on the subway.

* I love a good soundstage. My buddy introduced me to the audiophile world through his Beveridge speakers. Until then, I had no idea music could have that space and depth. My ATH-M50s were my first exposure to soundstage in headphones.

* I love the details the M50s pick up, even when driven through a laptop or computer speakers. No matter what I drive them with, I can hear the pick grinding against the string on an acoustic guitar. And that leads to really high immersion.

My goal budget is around $350. But I'm very willing to spend $500 on the right pair of headphones.

I went looking through the Sound Glossary, but I couldn't find the right terms.

So I guess I'm looking for a pair of headphones which sound like a blues bar at 2am, and an old string guitar.

Think you can help me out?

I really appreciate your advice.

(PS. I listen to almost everything on my headphones: They regularly play blues, heavy metal, drum n bass, dubstep, soul, acoustic guitar, a little classical... they even get used for games and movies.)

Thanks for the suggestion!

They look great. They also look like a sideways step from my Audio Technicas.

Is there anything in their line that's a step up?

I've been stalking this board for awhile. And when I picked up my M50s, they seemed one of the better picks for $200 / $250.

Is there any improvement if I shell out the extra $100 / $250?