Hegel H120 or H190

The advice on figuring out your potential speaker upgrade, what your preferences are and picking a new amp based on how it meets the potential new speakers needs along with synergy is key.  How an amp sounds paired with speakers is heavily impacted by the synergy between the two.  Even if you aren’t streaming currently, might be a good idea to buy an amp that offers the capability, opens up an entirely new world of accessibility.  Hegel is highly regarded and specifically for their integrated units, you won’t go wrong with them.  They also should be able to drive most speakers.  I’d lean into the 190 or 360 used, Hegel has a great reputation for their integrated amps digital streaming / DAC capabilities, you’ll get a slightly better amp / pre and gain the all in one package needed to stream should you ever get the itch.  Bang for buck, Music Fidelity makes some great integrated amps, used some models should fall within your price range, same with Peach Tree Audio.  I think PS audio also makes a Class D integrated that can be found at a good value used.  Schitt has built their brand off of delivering high performance and reasonable prices, would look at their gear, integrated units as well. 
 

Good Luck,

@boozendormi

I think you should buy the H120. Even the H90 would be fine, but the H120 would be a no brainer.

I tried 7 integrated amps in two months in search of my next best amp. What I found was that they matter the least. The source and the speaker make a much bigger difference.

Don’t buy the speakers first. You need to match the speakers TO THE AMP, not the other way. In your room size, the Hegel will do everything you need. Any 2-3K bookshelf speaker from Dynaudio or Wharfedale or alike would be a huge upgrade to the B&Ws

It's a bit of a shame you've ruled out the H390. Now that the H400 is replacing it, I fortunate enough to pick up one in a new/open box condition very recently for $4,500 and a new H190 is I think something like $4,200. Thinking ahead, if you can find  a new or used H390 in that range, the relatively small extra dollar stretch is definitely worth it. It will drive whatever speakers you get in the future admirably and the gobs of quiet clean power it has will just sound better at lower listening volumes with your current speakers. On the other hand, stereo gear is just like bikes. There is always something better for just a little bit more money.  My bottom line is go with the most power in their lineup you can swing. I  really like the sound Hegel amps produce and no matter where you end up in their lineup, I predict you will be a happy camper.

quiet clean power it has will just sound better at lower listening volumes

I seriously doubt that

Take this with a grain of salt as I dont know what kind of music you listen to, but a quick search on USAM turned up a pair of Harbeth C7ES and a Hegel h190 for around $4600 (separate ads) which are thought to have good synergy.

I based your budget on a new h190 listing at $4200.