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Something like this is probably the best you can get for around $650. If you don't want an overclockable CPU you can cut something like $80 off that by getting a cheap MOBO ($50) and a cheaper i5 ($200 vs. $240.)

http://pcpartpicker.com/p/MyQCWZ

I am also assuming you are getting a good deal on a Windows key, through something like Reddit or otherwise. (Nobody pays $100 for windows.) Also $30 or so for a decent mouse + keyboard.