What I find funny is no one asked what DAC you have. The best solution can vary depending on the DAC and what is the best input. Many devices use USB. This may or may not be the best input on your DAC.
Also, you have not mentioned a budget. These things range from $600 (Bluesound Node) to $47K (Pink Faun Double Ultras) that I am aware of. Best I have heard have been Taiko, Pink Faun and Antipodes but they tend to be pricier.
The point is there are are lots of brilliant solutions. What DAC do you have? Do you have a budget in mind?