To me this is a major upgrade, and MB, Processor, and Memory is a new computer. So I would put it on my Workbench and go all the way with a new Case, Power, HDD's, Graphics Card, and Blu-ray Burner. My Workbench has has Monitor and Internet Access. Then you can take your time and load everything properly. Do you plan to reuse some things, and what kind of down time do you give yourself?