Low power eh.
I'll start with my Sansui AU-217 integrated,it may be towards the BOTL for the AU series in terms of wpc (30 wpc) but NOT for SQ as it sounds superb.
Also really enjoy my NAD 3140 integrated amp and it's corresponding 2140 power amp (40 wpc) as well,both of those have excellent SQ.
Then there's my TEAC A-1D integrated @ 50 wpc,took adding a subwoofer to the pre-out to get it sounding like I wanted,but now it's my main machine.
As for power amps,both my "low power" Adcoms have been enjoyable in various systems so far (GFA-535 Mk1 @ 60wpc & GFA-5200 mosfet @ 50 wpc).
Other than those units most the rest of my stuff is (or has been) > 60 wpc...
And anything from years & years ago is long since lost to the fog of time,LOL.
HTH
Bret P.