PC good enough to run DayZ?

For the past month I've been trying to decide wether I want to buy or build a PC. I want a good enough PC to run DayZ, Minecraft, and all that good stuff. If someone could maybe suggest a good PC that I could buy from Best Buy or something (sorry if you're face palming idek) because I have not the slightest clue on how to build a gaming PC. If you could put links to websites or whatever I'd really appreciate it!

http://ironsidecomputers.com/
Has really great builds and build your own you need at least 4 gigs of ram and a decent video card to run dayZ maxed out but I play with 2 gigs on minimum settings and runs fine

Well if your really a noob at computers I can tell you a bit about. There's the processor which I recommend getting at least an intel i5 or intel i7 if your going for a graphics card go for something like geforce and have at least a 4 GB ram 8 would be really good. If you can't by a good video card (cause geforce can be exspensive) just run on lowest settings you should be fine.

I would suggest about 8gb of ram a decent GFX card (like this one if you are able to click this link http://m.bestbuy.com/...cat0507002 ) about a 630 to 750 watt psu to make sure you have enough power, and a 3.4 ghz processor unit