I just got the RDC-7, and it is really an excellent product. I have been testing the RDC-7 D/A vs. my CAL Alpha DAC. They are so very close, I could sell my CAL and be happy. The CAL is a Tube DAC, so it does have that Tube magic in the mid-range. My wife likes both, she describes the RDC-7 as Detailed and the CAL as muddied.
The RDC-7 has analog bypass and is so easily customized, I can't believe it. Their customer service is very helpful, I spoke with them during my search, to ask about their direction with this product line. As I am sure you know, the parent company is Onkyo, and this name is not really on the Hi-end list of Manufactures. This is intimidating to some who feel comfort in the "Name Brands". I explained my concerns to the Customer Service President, some of the advice I was given is "It is better to buy a Low-end product from a Hi-end company, than a Hi-end product from a Low-end company". The Rep assured me that Integra Research is indeed trying to become its own company, that is making a bid for the "Hi-end". He was very knowledgable about the product, and asked m to call back to explain why I did or did not purchase the unit.
There are so many surround and listening modes that are completely customizable for EACH input! Very easily laid out remote and great on-screen display.
Read the latest reviews of all of the HT magazines, they can't all be wrong. This unit performs HT surround duty better than I have heard (Lexicon MC-1 which is really good), and performs quality CD conversion that is both Musical and Emotional. The unit retails for $4K and I am sure you can find a use for the extra cash.
If I did not answer any of your other questions, please post back and I will do my best to try.