@jnehma1 : Hmmm! I knew the NAD M10 was an integrated amp but, for some reason, had completely confused the price point. You are obviously right about the price being well within budget as a standalone unit. However, the M10 doesn't have enough digital inputs for me (I need 2x coax + 1x (pref 2x) optical). Ironically, it has an HDMI input which is extra for the C658 (at least until an ex-demo units become available with the HDMI module already installed).
Unfortunately, the search is now on pause due to an unforeseen blip in my circumstances. For now, it's idle browsing and keeping an eye on the various NAD C 658 & related threads for developments (and references to possible alternatives). Experience has taught me that fate of this nature is, sometimes at least, a blessing in disguise. Maybe a new version, or a completely new product (whether or not NAD) will appear in the next few months blowing away the C 658. Alternatively, it will just be a rather frustrating wait before I can go ahead and get something that's already out there. The joy of music / hi-fi....
Happy listening all.