Hello, I own a mid-2011 2.7 GHz 21" iMac with a 1 TB drive. It has 20 GB of RAM. I am thinking of replacing it with a new 3.5 GHz 27" Retina iMac with a 1 TB Fusion drive but I am somewhat hesitant. My most intense application is photo processing with Capture One and web surfing. Capture One puts a strain on my computer and the display update can be a little jerky at times. It doesn't stop me from processing my images but the computer does get hot. I almost cannot touch the top of the aluminum case. Sometimes the fans will turn on if the day was hot too. Web surfing shouldn't sound like an intense activity but many webpages are very complex with lots of scripts and animations. The computer can become mildly warm. My iMac is running pretty hot as I type this long winded message. My previous iMac was a 2004 PowerPC based machine that I kept until 2001 when the power supply burned up and blackened the inside of the case. I had the computer repaired and sold it on eBay. That machine was eventually heavily loaded running applications like Handbrake. The jump to a mid-2011 iMac was amazing. Not only did I get a massive boost in speed by 3x to 4x but I also entered the Intel based iMac ecosystem. I feel that the jump from my mid-2011 iMac to a current model Retina system ought to feel the same as when I jumped from a 2004 to a 2011 iMac. Looking at the Geekbench 3.0 scores, I think the performance jump will be about 1.5x. Video performance is no doubt improved but I'm not a gamer requiring high refresh rates. The iMac Retina system is about $2200. That's not a small amount of money. I can eat and live on that for a long time. The upgrade better be worth it for that price! My other thoughts on upgrading my overall system would be to get a really nice 27" to 32" 4k display for easier photo editing, a Wacom Cintiq to get into digital art, or build up a film scanner outfit. I would run my current machine to failure and upgrade at that time. If my single past data point is to be my reference then I predict that I can get another 3-4 years of functional life out of my current iMac. I would not be surprised if the peripherals I mentioned load up my iMac and make me want to upgrade. Catch-22. My nearest Apple retailer is about 1 hour and 10 minutes away. I owe them a visit to experience the new machines. Is there something to be gained from a 27" Retina iMac that would enable me to do something that I can't do now? Would it enable me to do something that I do today but better? Thanks!