Gaming computer suggestion?

Okay so I'm saving up to get a gaming computer, but I'm not to good with like specs and stuff so I need help. What's the best computer to go for? I want one that like gaming youtubers have. Not to extortionate but one that I can play games on. Some games I want to play:
Call of Duty: World at War
Counter Strike: Global Offensive
Garry's Mod
Maybe Minecraft
GTA V
Also some other trending games like them in the future or what I might find interesting in the future.
P.S I want all these games to run smoothly. Thank you!

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