Building a PC for gaming. I am starting low price range with upgrades for the future. I have all the peripherals (keyboard, mouse, monitor) but need some help with the guts of the machine. I want to run the Total War games Rome and Medieval 2. My high end benchmark is King Arthur: The Role Playing Game 2 on medium settings without lag. Hoping to put that together for under $500. I am sure someone more knowledgeable than I could do it. Help?