Summary from this thread:
If 24" is enough for you the EW2440L is an excellent choice. It is no longer in production but there is still stock around for a reasonable price. It goes super dim which is great for those of us who can't look at bright LEDs.
If you need/want 27" the EW2740L is the best choice for the light sensitive. It goes very dim like the EW2440L. As you saw above it's been out of production for a while and could be hard to get a fresh model. Next up would be the EW2750ZL and the EW2755ZL (newer and slighlty better PQ than the EW2750ZL). They are not as dim as the EW2740L but not as bright as the GW2760HS. Finally the GW2760HS still has most of the things we like in BenQ VA monitors. It has VA panel, native 8-bit, PWM-free, decent PQ (but washes out at low brightness), but it's very bright at even its lowest brightness setting.