I'm able to buy a FiiO E07K, FiiO E12 or a FiiO E17 for a great price.
Currently, I'm using VSONIC GR07 and ATH-IM70 for portable use along with an HTC One.
At Home, I'm primarily using a Fidelio X1 on my desktop. I'm quite satisified with the sound I'm hearing with this setup.
The question is, will the sound quality improve with any of the above DAC/AMPs?
If no, should I still buy one for future-proofing in the event I'm buying higher-end headphones?
If yes, which FiiO should I buy that would sound great paired with my current setup?