I recently purchased the PW combo on Audiogon and was instantly thrilled with the performance. I do not use a preamp. I am still testing HDMI cables between the DAC and the Transport. I have tried a single crystal copper cable by Harmonic Technologies. I have just purchased an Audioquest HDMI-3 cable which is a silver coated copper cable but I have not yet made the comparison. An Audiogon member advised me that pure copper would provide the best sound. A person from PS Audio swore that its I2S-12 silver copper cable could not be beat. I will let my ears decide. But in all events, my jaw dropped to the ground when I played Carmina Burana SACD. My wife and family members couldn't believe the quality of the sound. I am not able to describe the sound in the audiophile terms so frequently used on this site, but in laymen's terms, the detail of the music stood out in bold relief. For example, in one song bells are rung and the ring kept ringing and ringing and ringing.... I think they may call this sustain. Based upon my brief experience with the PW combo I can highly recommend it and do not regret the purchase.
Good luck.
Good luck.