Start with an atx case, p45 motherboard, 2x2gb of pc6400, and 4850 video card. For the power supply, get about 500 watts, and buy separately from the case (except for antec). I recommend antec, enermax, corsair, seasonic, or pc power and cooling. The power supply and video card are based on your budget. Order the cpu last with whatever you have left. The e5200 or e7400 are value oriented and will get the job done.