You would appear to have little choice now. But, the Oppo 105D is a very good unit to use with analog to your Sony prepro. And, the Oppo can apply DSP for speaker distance and bass management in PCM playback mode, though not in pure DSD. I could not guarantee a better result using HDMI into a more modern processor, unless you liked what DSP Room EQ could do, like Audyssey.
I did prefer HDMI from an Oppo 93 to an Integra prepro using Audyssey MultEQ XT/32 with an Audyssey Pro calibration for awhile. I now use a DIY HTPC with JRiver's library/media player and Dirac Live EQ software into an Exasound E28 DAC via USB. That all sounds really, really outstanding. But, I cannot play SACD discs directly. I must rip them to my library using a Sony PS3. Downloads, CDs and BDs are no problem.
I have a number of friends who are happy with HDMI into either Anthem D2V or Marantz 8801 prepros, with which they play all media, including CD, SACD and BD from Oppo players and library PCs, including downloads on the PC, via HDMI. Their systems average in the $40-$100k MSRP range and they all sound quite good. Their setups are more flexible than my own due to the prepro, which I now lack, but I think my system sounds even better. They agree, but they are unwilling to give up the flexibility, such as for vinyl playback, which I do not need or want to do.
So, being able to use a PC for library playback of Mch to a prepro is another reason to use HDMI. There is no other easy way from a PC for Mch.
Of course, I did not mention video, and there HDMI is the current standard for quality. So, that is another reason in favor of HDMI. But, it need not carry your audio. I use HDMI to my TV monitor for video and USB for audio. It works fine.
