@cundare2 - I'm in the same camp; bad back and can't lift heavy equipment up steps.
Not everyone's cup of tea, but I'm driving 86 dB sensitivity Bryston Mini T's with my McIntosh MA5300 integrated amp. Here are some specs:
38 pounds unboxed.
Preamp out and Power Amp in jacks / home theater passthrough
6 analog inputs including MM phono and 1 pair of XLR balanced inputs
Class AB amplifier design
Built in "DA1" DAC with 6 digital inputs that can be upgraded/swapped out to McIntosh's DA2 since the onboard DAC is a module.
Headphone impedance is listed as 100 to 600 ohms.
$6,000 sticker, but you can buy them for less at dealers in person.
A drawback based on your requirements is that it's 160 watts at 4 ohms.