Originally Posted by fRingE
What would be a good external DAC
I strongly recommend you begin doing some research on your own and determining how much you want to spend on each component.
We can recommend you nice DACs for any price range. How much you want to spend is up to you. Also, DACs to a certain point become less about "better" and more about how they sound. They all have different sound signatures and the only way to know which you'll like is mostly to hear them yourself or see if someone who listens to music of your liking has chosen them.
Go to head-fi.org, type in all the questions you have in the search bar and learn. When you decide how much you want to spend on a DAC, how much you want to spend on a sound card, how much you want to spend on headphones etc, come back and we'll be better off helping you.