To get you started: http://pcpartpicker.com/p/30vQd A bit over your budget but perhaps you can wing that? Hopefully you already have a keyboard and mouse. You can save a few bucks by getting http://pcpartpicker.com/part/western-digital-internal-hard-drive-wd5000aakx for your hard drive, instead of the WDEZ10EX.
-What is best in life? -To crush your enemies, see them driven before you, and to hear the lamentation of the women.