Originally Posted by Reinkaos
What about Aune T1 Upgrade Version? And I will be only using headphones, I dont even own speakers. Oh and also im not using Dolby Headphone.
The Asus Xonar DG's headphone amplifier is more then enough for driving the 32-Ohm K550s.
But if you did decide to invest into a DAC/Amp.
The FiiO E17 technically is a better DAC and amplifier then the Xonar DG, not sure how much of a noticeable improvement it would have over the Xonar DG.
If you plugged the E17 into the Xonar DG's optical port, you could still use the DG' Dolby Headphone surround sound, which might help with movies.
Another option is The Epiphany Acoustics EHP-O2 (78 GBP) headphone amplifier, can work off an AC wall socket or it's own batteries (10 hours?),
it can drive headphones up to 600-Ohms, so would make a good long term investment.
Whatever leftover cash you could put towards an external DAC or even a sound card (used Asus Xonar DX or D1 sound card, CS4398 DAC chip).
Or just plug the EHP-02 directly into the Xonar DG, you can then take your time trying to decide on a DAC.