Hello George,
Agreed.
While there's currently no such thing as a class D input stage there is a company, Mola Mola, that offers a class D preamp and pair of class D mono-blocks that have output and input stages specifically designed to perform optimally when used together; the preamp is called the Makua and the matching mono-block amps, based on Hypex NCore 1200 power modules and and smps (switch mode power supply),are called the Kalugas.
The part owner and chief designer of Mola Mola, Bruno Putzeys, is also the inventor of ucD (universal class D) as well as class D Hypex NCore technology. He designed the Makua and Kalugas, as well as a unique and optional class D internal dac board for the Makua, that are designed to specifically perform optimally with each other.
I'm planning on buying pre-owned examples of all 3 of these Mola Mola products, which have all received numerous excellent professional reviews, within the next monthor so for about $12-14K.
I'll post my impressions on all 3 of these once I have adequately had the listening time to form them. I'm sure you'll be awaiting my thoughts with bated breath.
Tim