I am looking to buy a 27 inch iMac for my home office. There are 3 27 inch iMac models out there (1799.00, 1999.00, and 2299.00 prices) and I'm not sure which one I should buy. I would use it at home based business for internet, email, word processing, watch videos, light desktop publishing, Pages, Numbers, Keynote, QuickBooks, etc. Is the Retina display really worth it or is it just a lot of hype? Does it help resale value? How about the hard drive. Do I really need the fusion drive (don't even know what this is). I have always had just basic hard drives in all of my iMacs and never had a problem. Is it better to forgo the high end 27 inch model and just add more ram or is 8GB of memory enough for now what I am doing? I am not a gamer or a programmer. Will I really notice the speed difference between 3.2GHZ, 3.3 GHZ, or 3.5 GHz processor??? So, which model of the 3???