Wonder if anyone could offer advice on which of the new 24" iMacs would be the best to go for? I will be using the machine mainly for photo processing (Photoshop CS4 and Lightroom) as well as personal use - internet, iTunes, watching movies, etc. Processor: all other things equal, would I see big differences between the 2.66, 2.93 and 3.06GHz when doing (for example) some intensive task in Photoshop? Or would it just be 15% faster (3.06/2.66*100)? If we're only talking the difference between a 15 second image-adjustment and 17 seconds it hardly seems worth spending an extra A$1,200 to get the top-level model. Graphics: I'm not a gamer and am not planning to use the iMac for any games, so as far as I can gather buying a higher-level graphics card would be unnecessary. Is this correct? If anyone thinks otherwise, could you please give an example of how I might see different results using (say) the GT120 or 130 compared to the base-level 9400? Clearer image? Faster display? RAM: 4GB is a lot compared to anything I've used before. Would an upgrade to 8GB make an appreciable difference to photo-processing, or only if I'm working with huge image files? I figured if the basic iMac setup is plenty enough for my needs, then I'll be saving cash which I can spend on Applecare and an upgrade to 1TB hard disk. What do other users think would be the ideal way to go? Thanks in advance for your suggestions.