Lenny,
I guess you have your answer. Sometimes I do wish it was that simple.
BTW: There are very few K2HDs available. I had one, I personally didn't like it much.
As far as XRCD, there are XRCDs, XRCD2s and XRCD24s. Also, there are "old" Mofis (Mobile Fidelity Sound Labs) released by the original Mofi and "new" Mofis released by its current owner (Music Direct). Also, you didn't mention DCC (Dunhill Compact Classics) which also released some fine sounding CDs.
Argyro,
Could you clarify what you mean by "I have ALL the recordings from these companies..."?