An older review but noteworthy. I recently tried this DAC/Amp and was amazed at its performance. It also supports all of the inputs/outputs I would be interested in using including balanced out, toslink and multiple USB inputs. I picked up a used one on Amazon for around $780.
Below is the link on Head-Fi of the review by cloud_c.
Pros: DAC handles all formats, amp has great control and power
Cons: price initially, but not no longer as it has replaced several tried and true components