The Marantz PM7000N should be on your shortlist. It checks every box on your requirements list, and then some. I bought one to 'hold me over' while deciding on a pre/power/DAC setup, and after I got it broken in, I kinda stopped looking (although a McIntosh MA252 still tugs at my heartstrings, even if I would need an outboard DAC/Streamer). It drives my LS-50s, my Maggie MMGs, and my Monitor Audio Silver 300 7Gs just fine, as it delivers about 90W/Ch into 4 Ohms. As for headphones, its headphone amp likewise drives my HiFiman Sundaras just fine. I could go on about the DAC and streaming, and the HEOS app, the phono stage, but just check it out. As for the 40N, it's even more of the above, and 2X the cost at $2500, so its well over your $1800 budget.