I’ve recently purchased a Mac Pro 2,1 and don’t know much about them. I would like to buy a cheap graphics card and hard drive (it didn’t come with either) , I also am not sure on what OS to purchase. I’d like to eventually upgrade everything later, but not sure if it works. Any idea on a cheap graphics card? Would I be better off running windows? Will an ATI Sapphire HD 2600 XT work in it?