I'm looking to upgrade my computer sound experience by connecting both my stereo speaker setup and headphones to the same PC but I am unsure as to what kind  of equipment I need. I have lurked in the forums but am still unsure.
 
I am using Monitor Audio speakers and Advance Acoustic map-105 amplifier for CD audio and Pioneer SE-A1000 cans. Nothing impressive, I know, but I still feel I am not making the most out of it, and of course future upgrades.
 
I hear the Pioneer SE-A1000 aren't difficult to drive but I am having some trouble regarding the audio outputs of my pc - I had them connected to an Asus Xonar DG soundcard which suddenly started giving out rustling noises (which I know is static interference from inside the pc) so I removed the card and have it connected to mobo directly which I can notice is a downgrade in sound quality (same tracks are sharper or have less noticeable Bass for example).  For this reason I thought a usb DAC/AMP is what I needed but I read that its not good to drive Amplifiers through those.
 
So now I am looking for a device that can drive my current (and future) cans while also allowing me to enjoy better quality through my Stereo speakers/amplifier setup. As for a budget, if possible, I'd like it to stay in the 100  range but feel free to recomend something a little bit higher if its worth saving up to.

You might want check and/or join in the discussion in the Computer Audio sub-section of this forum.

The sticky there said questions were meant to be posted here so thats what I did. 
I searched the forums and some similar situations appeared but none answered my question directly.

osga said:

  The sticky there said questions were meant to be posted here so thats what I did. 
I searched the forums and some similar situations appeared but none answered my question directly.

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Perhaps do the the opposite of Jeopardy--and don't state it as a question.
 
The most and most knowledgeable people about computer audio hang out there--not so much here.