PC Help.

I'm currently wanting to build or buy a PC around $400-600.

My processer on my current computer is dying and is causing issues and I just want a new start.

Specs I would like are
Quad core
8 GB ram
Not sure about graphics card if anyone could suggest me one that would be great.
Games I play Crossfire,CS:GO I would like to get about 100-200 FPS.
Thanks.

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