I am considering getting a used MB Pro for editing home movies. OK, its not Final Cut Pro stuff, but this will be the most demanding thing I use the computer for. In the past I have used iMovieHD and iDVD to make movies on my 12" PB G4 with a 1.25 GHz processor and 1.5 GB of RAM and ATI Mobility Radeon 9700 with 64 MB or 128 MB (not sure which). This has worked fine, but I can tell its a little slow. I certainly can't plan on doing anything else at the same time. But, now the previous generation MB Pros are going for $1000 (used or refurb) on eBay and I am considering getting something like a 2.4 GHz / 2 - 4 GB with a 256 or 512 MB Nvidia 8600 graphics card. My question is: how much processing power do I need? If a find a good machine that has a 2.2 GHz processor and a 256 MB video processor will I be happy? Or should I spend a couple hundred more and get 2.4 GHz and 512 MB video? Bonus question 1) what is more important for video processing (home movies) overall RAM or graphics processing RAM? Bonus question 2) how concerned should I be about buying a used machine with the "known NVIDIA" problem"? I see a lot of machines on eBay that have had the motherboard replaced under AppleCare, which seems like a good deal. Bonus question 3) when a Mac refurb company like Mac of All Tades or Tech Restore sells a refurbished MB Pro do they replace the motherboard (esp if it is of the "known NVIDIA problem" generation"? Thanks for your input.