High Rez audio over HDMI

I have sollicated input on this issue before and appreciate all perspectives. Based on what I have read and heared myself, High Rez multi channel audio over HDMI is far from at its full potential and to some people (including myself) MC analog well done sounds superior. However, the Meridan HD621/861 combo seems to take it to the next level, albeit at exorbitant cost. Then there is the long awaited Theta CB III + HDMI due to be released, which one might hope outperforms their analog six shooter setup. My question is this; what is my best strategy in terms of optimizing bang for the buck and timing of upgrade to take my multi channel audio system to the next level (I am currently using an Onkyo 885, using SACD over HDMI and Blu Ray analog). I see a few scenarios:

Try to pick up a reasonably prices 861 and buy an HD621 for 3K. Total cost 9 - 10 K. Performance improvement ??? Timing - now

Try to pick up a reasonably prices used Theta CB III and get it HDMI upgraded for 4K. Total cost 8 - 9 K. Performance improvement ??? Timing - hopefully within the next 6 months

Buy another used acclaimed processes (Cary, Halcro, Classee) that supports HDMI. Cost 3 - 6K. Performance improvement ??? Timing - hopefully within the next 6 months

Wait for the technology to mature and someone comes out with reasonable priced gear that gives me Meridan / Theta level performance.

I'm curious about others' perspective on these options, and which path they would choose (or have choosen)