Best Solution for Level Shifting

It seems that the best solution to level shift the i2c lines, especially for high-end audio, is the optoisolator I was reading about. Not only enables the 5v-3.3v level shifting, but provides noise isolation preventing any potential high frequency noise from entering the DAC through the wires. This is what the data sheet shows. Vdd1 would be 5V and Vdd2 3.3V.