Hi Duncan, you may have already made other choices by now. But, for what it's worth, the Bel Canto s300iu is a great sounding integrated. Solidstate impact with tube like mids and naturalness. Offering up a very musical presentation. However, most all USB inputs leave a lot to be desired. I'm using an external DAC ( Arte Forma Fiona - dual mono design ) and a M2Tech Hi-face II SP/DIF 24/192khz ( no digital input on S300IU ) right off my laptop and running all WAV's. And it blows away the usb options. On this device, and most usb dedicated dac inputs. I highly recommend this type of setup for ultimate resolution.