Thank you :). I believe I will be going with the Schiit Magni.

I don't really need something portable. The Schiit Magni seems pretty good spec wise and price wise. The website says it can power up to 600 ohms; is this true, or am I reading it wrong?

Sorry, I did not mean to say mixamp. I am looking for a headphone amplifier.

What amplifier would be able to power the Beyerdynamic DT990 250 Ohm headphones?

I am looking into buying a pair of Beyerdynamic DT990 Pro 250 Ohm headphones. What mixamp would be good for the headphones?

If the Astro Mixamp does not have enough power (or I just want a separate mixamp), what would be the recommended mixamp that will do the job?

The DT990's seem like the solid choice to go with. What mixamp should I get with it? I have the newest Astro Mixamp that I use with Astro A40's for my Xbox 360 and PS4, but I may look into getting a separate one just for the DT990's.   Would the Astro Mixamp be good enough to power the 250 ohm...

The lack of bass in the ATH-AD700's are why I was not too sure about them and am open to other Audio-Technica models assuming the model is still comfortable and good sound quality.   As for budget, the ATH-A990x are $220 on Amazon, so they would be the highest I go. The DT990's 250-Ohm Pro is...

EDIT: After reading the posts here, I have settled on the DT990's over the Audio-Technica AD700. Unless someone can convince me that a different pair of Audio-Technica headphones are better, the DT990's are my choice. Now, the question is: What mixamp will do the job of powering the 250 ohm...

I was more so looking at the Audio-Technica ATH-AD and ATH-A series.

Thanks :). Anyone know how the Beyerdynamic and Audio-Technica headphones are?

So, the HD 558 or 598 should not give me neck pain during long sessions? My Logitech G930's do.

Two headphones I will definitely look into :). Still open for all other suggestions too; I would like to have as many options as possible :).

I am looking for full-sized headphones that are extremely comfortable for PC. I have bad experiences with headphones being too heavy and too clamping. I use them for gaming and listening to music. I do like some bass, but the bass does not have to be ridiculous. I play mainly RTS and MMO games...

Sunfire products seem overly power for a dorm room, no?