First-time Game Server Box build

[rainypayday]

Might be building a server box soon, I will be using it for hosting various game servers for myself and friends to play on.

Parts:
CPU - http://www.newegg.com/Product/Product.aspx?Item=N82E16819117286
Motherboard - http://www.newegg.com/Product/Product.aspx?Item=N82E16813182253
Memory - http://www.newegg.com/Product/Product.aspx?Item=N82E16820139262
Case/PSU - http://www.newegg.com/Product/Product.aspx?Item=N82E16811147098

My internet connection is 20mb/s, I'm not quite sure if that's enough however. I will be hosting and playing on them with about 5-10 friends in games like Terraria, Natural Selection 2, Counter-Strike: Global Offensive, Garry's Mod, and some others(not all at the same time obviously).

Feedback would be wonderful, thank you!

 

[rainypayday]

The internet speed is pretty good, but you need as much RAM as possible when hosting a server. My friend's minecraft server runs 20mb internet too with 16GB RAM and it runs great with 7 or 8 people. But, with 8gb, it struggled to keep 4 to 5 people on at a time. Although, it is not dedicated. Here is some better RAM; http://www.newegg.com/Product/Product.aspx?Item=N82E16820239102

I thought about that at first, but I didn't think I would need to much. Minecraft runs on Java, that's why it requires so much RAM to use, otherwise I'd get more, although that's not bad either(I love Kingston). Am I missing any parts? Also, what does your friend run as the OS for his server?

 

[rainypayday]

He runs Windows 7 x64 Ultimate. It has a FX8120 with a ton of other stuff.
You may need a hard drive... http://www.newegg.com/Product/Product.aspx?Item=N82E16822236338

I knew I was forgetting something! Always do, lol. Do you think I would be able to run it with Linux? Trying to save as much money as I can xP