You're either a serious gamer , a hardcore film /video editor or you are planning on ruling the world !!
Don't forget to add the cost of a 64bit OS into the equation . Also don't forget a good mouse and keyboard combo and a high resolution monitor ( as big as you can get to really work the graphics )
Read a few reviews of the "killer" ethernet card , for the increased price it's not worth it .click here for an unbiased review