Hi Murray, I own and have worked on both sizes and my personal opinion is that the new 24" model feels considerably larger that the 20". I find myself wanting to distance myself further from the screen and wanting to raise my chair so that it doesn't feel like I am looking up at the screen. It is a beautiful computer and I think you will find the experience very different from the feel of working on a notebook. I am very much an amateur and use my computer much like you wrote that you will. I only do occasional work in Photo Shop, and for that I find the 2.4GHz speed very adequate. If you do extensive work in Photo Shop or edit video, you might want to consider the 2.8GHz, but I personally didn't think the extra cost would have been justified for me for the way I use my computer. If you do decide to add more memory, one can buy it from other vendors than Apple for less than Apple charges. It is very easy to add yourself. I hope that this helps. Keith On Nov 29, 2007, at 11:57 PM, M.Milligan wrote: > Hello all. I'm new to this list. I've used Mac notebooks for many > years now. Soon we're buying an iMac. > > Our concern is the viewing distance required for the 20" & 24" > screens. Is there a minimum viewing distance one should be from the > screen? > > I want to use the iMac for home computing, web browsing & email and > also for Photo Shop work on my digpix. > > Should I max out the ram to 4GB? Is a 20" 2.4GHz clock speed > suitable for digital photo correction and related work, or is there > that much of a difference with the 2.8GHz? > > Any help is greatfully accepted. I thank you all in advance. Cheers. > > Murray > > _______________________________________________ > iMac mailing list > iMac at listserver.themacintoshguy.com > http://listserver.themacintoshguy.com/mailman/listinfo/imac