I had a 2009 iMac that crapped out so I was forced to decide this very thing last fall. I decided to go for the Retina screen because I could afford it and I thought it was simply amazing, which it absolutely is! I have no legitimate need for it, just do a little light photo editing and other typical stuff (actually mostly spreadsheets), but it's just a joy to look at. I also went for the i7, which is probably overkill for what I do, but I wanted to go for the high end based on the assumption that I would also have this computer for 5+ years. I went with the 3GB fusion drive and it's a really noticeable improvement over the old 640GB drive in my 2009 - the computer starts up within 10 or 15 seconds. I just went with the 8GB of RAM and bought an extra 16GB from Amazon for $150, so now I have 24GB. All in all, I don't think I'd recommend going for the i7 and Retina screen if you feel it's stretching your budget, but I'm sure happy I did!