[Shisno]

Currently on a Magni amp.
 
Does anyone have any opinions on my next headphone set?  Positional audio is a top concern, along with quality.  Looking for a set that costs under $300.  Also, should I be looking to for an amp, or should I stick with my current amp?
 
Thank you for any answers you can provide.
 
(EDIT: removed 'pre' from amp... my mistake)

 

[serman005]

  Currently on a Magni pre-amp.
 
Does anyone have any opinions on my next headphone set?  Positional audio is a top concern, along with quality.  Looking for a set that costs under $300.  Also, should I be looking to for an amp, or should I stick with my current pre-amp?
 
Thank you for any answers you can provide.

Open or closed?

 

[Shisno]

No preference.

 

[PurpleAngel]

  Currently on a Magni pre-amp.
 
Does anyone have any opinions on my next headphone set?  Positional audio is a top concern, along with quality.  Looking for a set that costs under $300.  Also, should I be looking to for an amp, or should I stick with my current pre-amp?
 
Thank you for any answers you can provide.

 
The Schiit Magni is a headphone amplifer, not sure why your referring to it as the Magni pre-amp?
Are you connecting the ATH-AD900 to the pre-amp (RCA) output on the Magni?
What sources or DAC are you connecting the Magni to?

 

[Shisno]

I'm by no means an expert on these things...
 
I have RCA stereo running from the sound card to the magni.
I connect the headphones via stereo plug adapter to the front of the magni.
Source is an Xfi titanium HD.

 

[PurpleAngel]

  I'm by no means an expert on these things...
 
I have RCA stereo running from the sound card to the magni.
I connect the headphones via stereo plug adapter to the front of the magni.
Source is an Xfi titanium HD.

 
So PC > Titanium HD > Magni > headphones.
Using the Titanium-HD as a DAC, then connected (RCA to RCA) to an external headphone amplifier is something I consider a good setup. 
 
Beyerdynamic T90 headphones
Used, $250
http://www.ebay.com/itm/Beyerdynamic-T-90-Headphones-Silver-/152430663870?hash=item237d9358be:g:A~UAAOSwEzxYSLh4