It is a great time to be an audio diy’er. There is currently great availability of quality boards aiming at providing the greatest fidelity with incredible VALUE.
Here are some side by side photos of the two USB-I2S interfaces I own.
Worthy of mention is the upcoming next generation Wave IO board. Mr. Lorien posted a sneak peek at his next generation board [link]
From the look of the layout, this board has electrical isolation of the outputs and flip-flop reclocking after the isolator.