The one thing I would question is your need to go the separates route. With a $4000 budget, you're in a difficult range where a combo of separates may not be better than a really good integrated.
In fact, for $4000, I can't think of too many separate combos that would clearly trump an LFD Mistral or Plinius integrated. Both of those you could get brand new and still save at least $1,000, plus you would need one less set of interconnects ($100-500) and not have to worry about preamp/amp synergy.
I'm sure you'll get a recommendation about using a combo with good passive preamp, since they are much less expensive. In theory, you can get more performance for the dollar going this route, but it's unconventional and tricky.