Yes, please try D2 on SBT with Enhanced Digital Output (EDO) plug-in. It sounds significantly better than PC USB connections. I've used JRiver+WASAPI and cPlay with ASIO. SBT+EDO is flat out better.
If you have followed some CAS setup threads, the best sounding setup right now is Linux Ubuntu with RT kernel patch. It is a realtime kernel with high resolution timer. It beats Win7 or Mac OSX setup. SBT+EDO is essentially a Linux PC with RT kernel with a touch screen, a disabled sound card, wifi and LAN connection. It is a bargain for what it can do in this case.
The EDO plug-in is very new. It just came out on April 7!
Make sure you install the latest server software, LMS 7.7.2 before you proceed with SBT and EDO.