Today: New gaming build based on AMD A10-5800K?

So I want to build a gaming computer for as cheap as possible, and I came across this AMD A10-5800K Trinity 3.8GHz (4.2GHz Turbo) Socket FM2 100W Quad-Core Desktop APU (CPU + GPU) with DirectX 11 Graphic AMD Radeon HD 7660D for $129, which means I wouldn't have to buy a graphics card as well as a CPU!

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

My budget is IDEALLY less than $400, but will go as high as $599 for the whole computer.

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Approximate Purchase Date: today

Budget Range: 400-599 After Rebates; After Shipping

System Usage from Most to Least Important: gaming, streaming video, surfing the internet

Are you buying a monitor: No

Parts to Upgrade: All

Do you need to buy OS: Will have to pay $40 for Win8 upgrade, so include in cost

Preferred Website(s) for Parts: I can get a Newegg discount of I think 10 percent

Location: Los Angeles, CA

Parts Preferences: AMD because it's cheaper

Overclocking: I'm open to it, but never done it before

SLI or Crossfire: Maybe

Your Monitor Resolution: 1080p? (I'm not at home, so I can't check)

Additional Comments: Would like to play games like Guild Wars 2, LOTRO, X-Com -- doesn't have to be top of the line -- recommended requirements are fine:
http://support.2k.com/entries/2216 [...] quirements

And Most Importantly, Why Are You Upgrading: I'm having trouble running games like Civ IV (!) and LOTRO