Integrated amp

Hegel 590 or 390.

Depending on budget the s Gryphon Diablo Top if the heap
Pass labs integrated 250.8, or 150.8 $6800, $9500 
Coda ,an ex engineer at Threshold, and worked with Nelson Pass 
excellent integrated for around $5k
if you only have $2500 Peachtree nova 300
therre are other but these come to mind 

I have 3 systems, Two Hegels and the 700i. The 700i is in another league over the Hegel integrateds, as is the 600i which a friend of mine has. The Hegels are good but the Simaudio units sound like separates. As stated earlier you have to test things out yourself. Our opinions won’t really be that helpful.

Depends on what Hegel amps you are using. The later Hegel’s (H300 or more current H360 or later) are very good with good power reserves for demanding speakers. 

Really surprised no one has mentioned the Peachtree Nova 300 or 500, I went from separates to integrated last year and after much review went for the Nova 300 and am thrilled with the results. Goobs of smooth clean power and a fantastic DAC, sexy cabinet with a high girlfriend approval rating. The only people that don't like it are my neighbors!
https://www.youtube.com/watch?v=tWTePoxKHbQ
https://www.themasterswitch.com/peachtree-audio-nova300-review