Which integrated amp do you suggest?

I concur with the Yamaha A-S801. I have a used one that I could be convinced to let go of if interested. It was my first real integrated amp and served as the catalyst to what has become a very expensive, but very rewarding habit. I had it in service for about 6 months, so it is nicely burned in but not ragged out.

NAD C368.  Does everything you need and is upgradable.  No usb but has bluetooth.  I have one and sounds great.  You can get it refurbished on eBay with a manufacturers warranty for $675 from safe and sound hq.  Sometimes eBay has site wide discounts which will bring it down further. 

Very happy with The Krell Vanguard! (digital version)

Hello,I am building system  for a small  listening room much like yours. sources are Tidal and vinyl.  I will be purchasing an integrated amp, Sonos connect , and entry level turntable Pro-Ject Debut Carbon. I have  Martin Logan 35xt speakers in hand. It is not much compared to others on this forum, but it fits my budget, and sounds good to my ears.

I went by my local audio store last week. My salesperson, who has always steered me right, and understands my budget, suggested a Rotel A14. This model meets all my needs and you may want to take a look at it. I have a Rotel RB-1552 MkII driving my outdoor speakers and it works very well for me. Although, I am curious why no one ever mentions the Rotel brand on this forum?

+3 Yamaha A-S801

great piece - love mine.