¿Power Supply and RAM? Fujitsu D3417-B11 + i3-6100

Hello!

I have finally decided to buy Unraid

Now I have to buy some missing components and I need advice on power supply and RAM. I currently have this:

Fujitsu D3417-B11
i3-6100

I found this pack almost new at €50.

I want 16Gb of RAM. I have seen that many of you only put a module. Do I buy only one 16gb module instead of 2 8Gb ones? Does it matter in Unraid? Why do you usually put only one, consumption? Any recommended model? I don't want it to cost me €100 and I could buy it second hand.

As for the source, according to what I have read, the most "famous" is the Corsair, but I have seen that the Be-Quiet are also good. For the moment I am going to put 3 WD Red 3.5, 2 2.5 and maybe some 10Gb PCI card.

I have seen these:

Be Quiet! Pure Power 11 500W 80 Plus Gold: €85
Be Quiet! Pure Power 11 600W 80 Plus Gold: €95

Be Quiet! Pure Power 12 M 550W 80 Plus Gold Modular: €100
Be Quiet! Pure Power 12 M 650W 80 Plus Gold Modular: €120

Be Quiet! Straight Power 11 750W Modular 80 Plus Gold: €145

Considering that I need 5 SATA connectors and possibly some more in the future, Be Quiet! Pure Power 11 brings 6 connectors.

Any recommendation?

Thank you very much for your help.

Greetings.