That depends on various parameters.
If you're using the speakers on a desktop and don't listen at extremely high volume, the Topping PA5 II or the 3E Audio A5 are perfectly adequate.
However, if you're placing them in the room, sitting 2-3 meters away, and occasionally want to listen louder, I would recommend the A7SE, A7, or PA7. If you don't plan on switching to 2-ohm speakers in the future, you can save significantly with the A7SE.
I'm using both the Elac DBR62 and the Carina BS243.4 with the PA5 II. Since both speakers are 6 ohms and about 86 dB, that should be comparable to your Emit 20.