I know this has probably been covered before, but I would like to get a newer Mac Pro for doing photo and video editing. Not professional usage, but serious amateur. Mainly Aperture with some iMovie and maybe eventual Final Cut Pro as I get further along. I currently have a 24 inch iMac 2.4ghz Core 2 w 4 gigs of ram and an HD Radeon 2600 w 256k ram. I am looking at getting a refurb Mac Pro. My questions are: 1. What are the differences between the Westmere and the Nehalem processors. Is there a reason to get one over the other? 2. How many cores? Is a quad core system enough or would a person be better off spending the extra money on an 8 core system? 3. Graphics card. Would you be better off upgrading the graphics card rather than going from a quad to an 8 core system? I would like a system that would be fast enough that I would not feel the need to upgrade for at least 4-5 years. I'm pretty happy with the iMac I have had for the past three years, but would like something that is easier for the user to upgrade, as the Mac Pro is. Just want to make sure I spend enough but not more than necessary. Thanks.