My player is connected to a multi-channel USB card that has I2S outputs: http://www.diyinhk.com/shop/audio-kits/101-xmos-multichannel-high-quality-usb-tofrom-i2sdsd-spdif-pcb.html
This card is based on the latest XMOS XCORE chip.
I find I2S connections preferable to spdif, at least with my “digital” amplifiers. They must be kept short (though in practice I have found no degradation in quality using up to 50cm lengths). Shielding of cables is recommended (have not gotten around to it).
Here is the setup, with the USB card connected to the I2S input of the V200 amplifiers: