The EVGA W1 series are close to crap, Corsair CX series (old series) are sub par quality, and those TX power supplies are rather old though I think they have DC-DC (there are atleast 3 versions of it).
Why do you want an efficient power supply? What are your electricity prices? Because for the majority of people using a 200w consuming PC like yours, efficiency is mostly negligible.
There are usually much better power supplies available, for example the Corsair Vengeance, Corsair CXM (2015), Corsair CX (2017), CoolerMaster MasterWatt, be Quiet Pure Power 10 400w+, or possibly better.
What is your budget and where are you located?