What IC's works best with ML390s cd player?

Glad to hear you pulled the trigger on the 390s. I've been pleased with Cardas Golden Cross direct to my Aleph 3. The Golden Cross seems very quiet, the background and small silences are deep black. For me, this heightens the color and dynamic character of the 390s.

I am using a Harmonic Technology "The Magic One" in a balanced configuration. It is going through a ML #380 to a #334 and the sound is very detailed. It sounds much better than the Audioquest Diamond X3's I had before. Good luck, you will love the 390s.

I use Synergistic Research "Designer's Reference" balanced interconnects with my 390S. Haven't compared to other interconnects since I upgraded from 39 to 390S.
Craig Zastera

I'm using AcousticZen Matrix Reference ICs (balanced)into my 380, Transparent Reference to my 332 and Transparent Reference to my speakers. I've been happy with the results, though I plan to try the 390s direct to the 332 using the Transparent wire when I finish building the new listening room.

another vote for the Cardas Golden Cross