[maclenltd]

My headphone quest originally started with the HD555's which I loved but outgrew. I picked up the HD600s, which had a very tight clamping force that I didn't find very comfortable. I tried various AKG headphones and the NAD VISO, but ultimately bought the HD800s, which served me well for many months until I got tired of the extremely revealing treble (and needed the money). 
 
I'm now looking for a decent pair of open-backs with a wide-soundstage and somewhat relaxed treble. I was thinking about the Grado E series, but unfortunately can't demo any in person so I'm not sure what model would fit my needs. I'm looking for something comfortable without a tight clamping force on my head. 
 
I'm also aware of the value of amping headphones and have had Violectric amps in the past, however I will not be using any amps for these headphones. They're primarily going to be for just sitting back and relaxing. Sources will be iPhone, iPad and PonoPlayer

 

[Kozic]

HE-400i may be what you are looking for. Take a look at some of the reviews here.
Good luck

 

[Badfish5446]

I too started my head-fi journey with the HD-555 many years ago, I'm a huge fan of the Fidelio X2, I found the whole frequency spectrum to sound natural(not necessarily "neutral") and are my favorite headphone (of my collection) sub $500.

 

[Thenewguy007]

The AKGs are probably the closest in terms of soundstage to the HD800.
 
Which AKGs did you own?

 

[KG Jag]

Look into the Audio Technica  ATH-AD1000X & 2000X.

 

[maclenltd]

  I too started my head-fi journey with the HD-555 many years ago, I'm a huge fan of the Fidelio X2, I found the whole frequency spectrum to sound natural(not necessarily "neutral") and are my favorite headphone (of my collection) sub $500.

I've read good reviews of the Philips. How is the comfort level in your opinion?

 

[maclenltd]

  The AKGs are probably the closest in terms of soundstage to the HD800.
 
Which AKGs did you own?

I tried the Q701s and the K712Pros

 

[howdy]

I would recommend the Hifiman he400i as well, they sound amazing!! They do sound better amped regardless what they suggest.

 

[Badfish5446]

  I've read good reviews of the Philips. How is the comfort level in your opinion?

Fantastic unless you have a rediculous hat size