I have a mid-2011 iMac base i5 2.5ghz 500g HD with RAM increased to 20gigs. As it's coming up to 4 years old I started to think about the future i.e. maybe a replacement. However, when I look at the like for like replacement at the Apple store I see not that much has changed in the intervening 4 years. I really don't want a 27" screen and so have come to the conclusion that although my current model may not be quite as nimble as she once was a replacement wouldn't offer me much more than I already have. Is it lack of innovation by Apple or is the technology simply not moving forward a pace anymore? Normally the price of computers tends to stay the same but four years on you get a lot more bangs for your buck.