I am in the process of fine tuning my system and one of the things I am looking at is a PC based music server. I am in the market for a DAC to pair with my HTPC. Currently I have 500GB of music stored on a HD. Most of them are stored as .flac and .alac files. The computer is a antec fusion black (htpc chasis), intel core i3 cpu 3.20 Ghz, 8gb ram, 64 bit operating system(W7). I have done some reading and I have come across various USB DAC's (some asynchronous, some not). I was wondering if I could get some suggestions/recommendations from you guys. Is a asynchronous that important? Would it be cheaper to get a USB to S/PDIF converter and standalone DAC? I am looking for something that is built solid to go with a pass pre-amp (XP10) and 2 channel amp (X250).