I'm looking to upgrade from my old 1.8 Dual Core G5 as its starting to get a little bit sluggish, so I'm looking into the mac pro and have a few questions. Is it worth the jump from 2.0GhZ to 2.66GhZ? What sort of speed increase would I see? The primary use of the computer is for editing, so using Final Cut, Compressor, Motion, After Effects, Photoshop maybe. Is it worth the extra cash? I'm looking for the most cost effective solution. Also, with the RAM, I think I 4GB would be good to get for what I plan to use it for, but I want to try and save some cash and buy it from somewhere like Orca Logic or somewhere rather than with Apple. Does the RAM need to come in pairs? If I just order the standard 2x 512mb then want to upgrade to 4gb, can I just buy 3x 1gb sticks? Then they wouldn't be in pairs? Any ideas for this, its too early in the morning to try and get my head around that.