No, not like this crappy hp pavillion.
I'm talking about a real PC, like the ones you see on CyberPowerPC, without overpaying.
I'd like a LAN PC, aka something that looks like this:

Although, I'm very confused on what to get.
I want something that can run games like Skyrim at a decent FPS (20 or 30), and other games at a high FPS (TF2 at 100 or so). But other than that like processors and video cards, I don't know what accessories or other items I should get. Should I get a new mouse and keyboard? New headset? Other things?
Please let me know what I should get and what I don't.
Also, I'm leaving this seperate from the Personal Computer section because I feel as I want it to be seperate from other discussions there. It's not necessary to put this in there.