First post. After raiding the search function and reading a ton of reviews, I am still on the fence between an iMac selection. Background: Im about to start grad school and my 2011 macbook pro isnt going to cut it. I have a wife and two small children (2 months and 3) and in the next year or so, my 3 year old will probably start using a computer for some educational/early childhood development programs. I have not owned a desktop in my adult life, but most of my work will be done at home, so I am setting up a study/office and would prefer more room to research and write. I do some amateur photography and currently have aperture on my macbook pro. Bottom line: The primary use will be writing and researching, with a little photo and kid stuff here and there. My options: 21.5" 2.9 ghz iMac $1489.00 27" 3.2ghz iMac $1789.00 27" 3.3ghz Retina iMac $1989.00 Supplemental info: I wasn't considering a 27" at all, until I realized that when I research/write I typically have 7-10 windows open at a time. This is exhausting on my macbook, since I am constantly filtering through windows to find the one I need. I would cut down on that a lot with the 21.5", and tremendously on a 27". I have a large desk (63"x23"), so a 27" wouldnt be too large. Plus, I am going to put it on a riser. Also, bigger is always better, right? Lastly, I know I dont "need" a retina iMac, but at only 200 dollars more than the non-retina 27", I feel that it would be stupid to not at least consider it. If they are all going to be moving in that direction, I would like to not replace the new machine for as long as possible. Having updated technology may help combat that. Thanks for the help on this.