Synchro-Mesh is the cheaper and simpler upgrade to go with, and particularly good with the Dynamo supply and BNC-BNC cable with adapters.
If you are ready to go with computer audio, then the Off-Ramp 5 with the HDMI Hynes reg upgrade and an I2S cable from Revelation will perform even better. You will also need a really good USB cable, and the Dynamo upgrade improves things as well. A lot more expensive, but the results are in line with the additional cost, and you get bit-perfect hi-res file playback.
Steve N.