I had been enjoying my Primaluna EVO 300 for a few years, compared it to many other options (including some significantly more expensive ones) and in my system the Primaluna just sounded right.
Recently I upgraded to a Unison Research Unico 150 and I'm quite happy with it. Again, not the most expensive piece in the world, but it fits my preferences perfectly.
Separates can be fun as well, I have had good and bad results there so it's no guarantee of an improvement over integrated designs.