My Mom called me yesterday and was in a panic because her 2008 iMac 20" is starting to die. It's grinding a lot and she is getting beachballs that spin and spin and spin even after restarting. I told her it was probably the hard drive going and it's not worth fixing. Anyhow she needs a computer right now so there is no waiting a month or two to see if Apple is coming with something new. She wants me to pick one up at Best Buy and bring it to her. She is 74 years old and the only thing she really does is Internet (she LOVES Facebook and YouTube) and digital photography. She might type a Christmas letter to send out or view pictures. That's about it. So anyhow it's mainly an Internet machine. She DOES NOT want a laptop. I think it is sort of her age. Anyhow I read through the 3 different 21.5" options for the iMac at Best Buy (the 2 non Retina and the Retina) and she wants the base Retina 4k with the "dreaded" 5400 RPM HD. Best Buy has it on sale for $1,349. Now I know how an iMac with a stock HD performs and my 2011 with the 7200 is certainly acceptable, but I keep hearing horror stories. How bad do these things really perform? I'd have to think the performance would still be a HUGE step up from her 2008 20" 2.4 Core 2 Duo with 4 GB of RAM. She wants the Retina because she thinks it will be easier to read text with her 74 year old eyes. Any truth to this? Anyhow she wants a computer very soon so any opinions would be great. I just want to know if the stock 4k iMac would be a good machine for a light user. Thanks!