The RAM will definitely make for better performance than the tiny speed bump of the other CPU.
As the OS and CS3 get improved to take advantage of using the GPU to supplement the CPU, the ATI card might give a bit of advantage... Not sure how much of that capability is truly available at this point though.
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No games, or 3D, or anything like that!
As the OS and CS3 get improved to take advantage of using the GPU to supplement the CPU, the ATI card might give a bit of advantage... Not sure how much of that capability is truly available at this point though.
Otherwise get the last gen iMac and add the RAM yourself. You get a real GPU and a faster CPU.