Integrated amp recommendation

I personally use a Peachtree Nova 300-Bluesound Node 2i - I use the Nova's DAC-; Pro ject CD transport and Harbeth 30.1 monitors in a very small square room. Night mare(!) but after much stress it sounds pretty good for such a modest system. They are giving these Peachtrees away but they are a good value. Lots of power for the money (class D but think of the environment). I play this thing all day. If I was to change and spend more money I would just change out another integrated with DAC. MacIntosh or Luxman or Hi Fi Rose (no DAC tho). Good luck, perhaps spend more now on Integrated unit.

OP, I just listed a Cambridge CXA81 on USAudiomart for $850.  Would be ideal for you.  Use coax out from you Node2i to use the Cambridge DAC.  You won't be disappointed.

If I was looking for a used integrated amplifier in the $1500 price range the Belles Aria would be on my short list. It delivers 75wpc into 8ohms. My spearers are easy to drive however. 

I  haven't looked extensively but have not found  the Aria spec for 4ohms. Also not familiar with your speakers. Question is how much the speaker impedance drops below 4ohms. 

Not to over push the Rogue Sphinx V3, but there is a Stereophile review which includes a measurement section providing detailed account of this amplifier. 

Both Belles and Rogue are good companies to deal with.

The $1k Outlaw Audio RR2160MKII stereo receiver may be a good option.

Another +vote for AYRE Ax-7e.  Thank me later.

Happy Listening!