03-26-15: Rlwainwright
I hear you, Al, about the Ayre preamps. However, their lowest priced preamp, from what I could see on their website, is right at his stated budget, leaving no money for an amplifier. But I may be wrong about the pricing, please educate me if I am.
RLW, I don't know what the current pricing is, but based on many ads I've seen for used pieces (which the OP indicated he would be receptive to), current versions of the -5 series amp (the V-5xe) and preamp (K-5xeMP) should be findable used for a total of around $6K, and perhaps less. And I'm sure that earlier versions of the V-5 and K-5 can be found for considerably less than that.
I don't doubt that your suggestions are all excellent in their price range, but given the calibre of the speakers the OP ultimately envisions going with, and given his budget, I would expect Ayre to be a better choice.
03-26-15: Xerotrace
I run most of my music from my Laptop using a NAD 1050 DAC so that might also have to be a consideration as well. I honestly don't know how much focus to put on the DAC...
The DAC is certainly important, of course. But the rapid evolution of digital technology these days, and with it the likelihood of continuing improvement in performance per dollar, would seem to suggest that upgrading your integrated amp should take priority. Also, although I have no specific knowledge of the D1050, FWIW its use of asynchronous USB, its claimed 24/192 capability, and the fully balanced analog signal path it apparently has would seem to be encouraging with respect to its use in the near term. As are
this review and
this one.
Regards,
-- Al