I got my 2010 for $100 and that was with an i7. So I agree, 2010 iMacs are pretty cheap compared to monitors. I think that the reason is the HDDs can go bad and there's not much you can do about it without taking them apart. A lot of them that I see have base RAM as well and they run like absolute dogs with minimum RAM. I generally won't touch a used iMac unless it has an i7 unless it's after 2013.
I would not mind a second 2014 - it's a very nice model with 5k and it doesn't have the known tinge problem that the 2015s have. The Late 2015s also have the issue where they use oddball RAM so it's very expensive to max it out. The 2017s and later are all fine and they are starting to get very attractive.
I have late 2009 i5, 2010 i7, 2011 i5 (and 2020 i5). From these the 2010 runs hottest. I am wondering if it is for the processor. But in fact it is the PSU that gets hot in all of them, so I dont know why in the 2010 it gets even hotter than in the other two.
I am fine with thick iMacs, being either i5 or i7 as long as they have at least 16 GB RAM. But they are easy to max out to 32, although that means you double the purchasing price. (Putting in an SSD and a better videocard sure gets you in the region where tapered iMacs can be bought.)
As told before my 2020 iMac has the nano glass, so I can not really compare retina with the previous screens. But I have the feeling retina gives me not much in crispness. I would like to see a retina with glossy glass, I have the feeling that nano glass brings me more harm than usefullness. (Yes, it cuts some of the reflexions but not completly so they still are there and my brain filters them out without problems on the glossy screens anyway.)
Also I like the colors of the thick iMacs better. Silly, right?
What undobtably is of use for me in a retina screen is the real estate space. I need it for charts. But when in classci resolution I tend to think it brings me nothing (but again, I have to see a glossy retina).
What I like more about the thick iMacs is the sound. Again only based in comparing the 3 above mentioned with the 2020. They have fuller sound, whereas the 2020 sounds metallic. I guess it is caused by the more volume of the thick iMacs, but I could be completly wrong.
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