So i just bought the HP Envy 700-056/700-216 (http://www.officedepot.com/a/products/848252/HP-Envy-700-056700-216-Desktop/). The specs are pretty high i think, except for the power supply unit (300W) and the graphic card (AMD Radeon HD 8670D). My budget is about 350, please recommend a good combo to play games like "The Witcher 2"... Thanks in advance
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PS: I have never changed/replaced any parts of a desktop before, so I would greatly appreciate if anyone could give me a link for a video or something about that stuff.

PS: I have never changed/replaced any parts of a desktop before, so I would greatly appreciate if anyone could give me a link for a video or something about that stuff.