John,
Thanks. I recently picked up a Magnum Dynalab MD-100 at a good price, and it works splendidly. So, for now, I'm not pursuing the MF tuner; but I'm still very interested to know if there will be one!
Side note here - I bought another X-10 v3 to run the tuner through... When I got the tuner, I was still waiting for Red Dawn interconnects (and still am), so the quickest way to test the tuner was to switch the interconnects from X-Ray to tuner; and the X-10 V3 was already in the path. Subsequently tried it +/- X-10, and the conclusion was ... whoa! I need another X-10 to process the tuner signal (cheaper than getting the MD tube upgrade for the MD-100)
I did pick up a X-PSU to drive the X-10 (big improvement), and an X-DAC to run the X-ray through (that was not the original purpose for the X-DAC, but that's what it will be doing) - also an improvement.
As for the Q of the X series not being 100%... dunno yet. I am beginning to think it's the speakers. I am on a budget here, and I auditioned a bunch of speakers with a dealer. The JM Labs were very impressive for their price (I listened to speakers at twice the price that sounded awful), but as things continue, they seem to be very bass heavy. I'm tentatively considering moving from the X-150 to the X-Pre and X-power setup, or maybe move to a Musical Fidelity KW amp. I really like the MF sound. Anyway, have some way to go when the Red Dawns arrive, and will have no money to make big changes like new speakers or amp for some time.
K