MF X-DAC

MF V-DAC is very good in this application, you can get one on 30 day trial. List is $299 but I think soneone was offering them for $250. Used would be even cheaper. Beats many much more expensive DACs. I have never had an X-DAC so can"t help you there.

yes, you can. But you may need an USB to Coax converter, such as the MF V-Link to hook it up.

@Stanwal, to which dacs have you compared it?

In my own system to Audio Synthesis DAX, Musical Fidelity TriVista 21 and Rega DAC; in my friends to Musical Fidelity A5. I think the Rega is a little better but it is as good as any of the others and better than the dac section of the A5. It beat out a lot of more expensive dacs in HIFICRITIC's tests, the Benchmark for example, and it was only slightly worse than one of the older MSB $10000 dacs. HIFICRITIC thought it was the cheapest component they had ever tested that could be used in a top end system. Sounds even better with something like my "Little Pinkie" power supply. Another friend eventually bought one after hearing mine in his system.