My church is purchasing a new Mac Pro and I have a few questions. I was thinking about purchasing a last gen model upgrading, or even buying a bottom current gen and upgrading ram, HDD, and graphics. I understand that as long as you use DDR3 and ECC ram, then last gen can use it, and any sata 3.0 drive under 2TB can be used in last gen. My question is can I use a PC graphics card? Can I buy a stock ATI 5870 and use it, or do I have to be ripped off by Apple and buy their version? I guess I should also ask for general advice if I should forget about buying last gen because the new ones will be so much better for what I need. This computer is dedicated to Video Editing with FCP, and lots of work in Motion. We currently have a G5 so anything will be better, but what is most important to video editing. Max RAM? Fastest processor? or the best graphics. Thanks.