I'm looking to spend between $1000-$1500. I'll be playing Skyrim and fallout mostly and being able to run Space Engineers would be great.
Throw your ideas at me
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http://pcpartpicker.com/p/TmQXXL Pretty standard build that you will get a lot of mileage out of. I'm just playing with your budget, though. You could save some money and still get similar quality.