I built my current PC w/ windows 8 OEM copy for right round $900

Break down of whats in it.

AMD A10 6800k 4.1ghz
16GB DDR3 Don't remember clock speed. It's in the middle of the road.
256gb Samsung SSD
1TB Samsung HDD
Azrock ITX motherboard
Bit Phoenix Case.
120mm Cooler Master Sealed water cooler.

Did not buy any Peripherals and reused my 750w PS and XFX 5770 for old computer.

Running the game full screen 1080 getting 50 fps with graphic scaled back from max slightly.
just things I don't really care about lick PC & NPC shadows and I think I have Grass turned off most the time.
I have no doubt I could run maxed all the time with a better graphics card.