Thinking of replacing my obsolete iMac from 2013 with either a refurbished iMac Retina 5K 27-inch 3.6GHz Ten-core i9 (Mid 2020). It comes with 32 gb of Ram, 8 TB storage and seems like a very good deal for a little under $1,800.
That does sound like a
very good deal (as
@wilberforce says, probably worth a fact-check) but
mainly because the 8TB internal SSD upgrade would have nearly doubled the original price of the machine to about $5k (even if they got cheap 3rd party RAM). Even the base i9 is over-specified for what you need, and there's no way you're going to justify 8TB of
super-fast, super-expensive SSD. In my book, a bargain price on something you
don't need isn't such a bargain.
That doesn't mean don't buy it (if it's legit), it means don't feel
compelled to buy it for fear of missing a bargain.
The biggest argument for old iMacs in general is that beautiful 5k screen which - today - will cost you at least $1200 (for the LG - if not, $1600 for the studio display) for anything comparable. Still, that's "nice to have" rather than "essential" - especially if you're only editing standard def video.
I'd like to learn basic editing with iMovie and perhaps FCP, and have a lot of Hi8, BetaSP and VHS tapes that I hope to digitize and work with.
That's well within the capabilities of your 2013 iMac (the problem there is that you may be stuck on old versions of FCP and iMovie) - otherwise you're talking
standard definition video in the age of 4K, and needing gigabytes of storage in the terabyte era. The base MacBook Air or Mac Mini with no upgrades should do the job, although I'd always get at least 512GB storage and 16GB RAM for running "pro" apps.
The question is, therefore, how much "room to grow" do you want to pay for?
Or a new Mac Mini with 16 gb Ram, 2 TB storage for $1,700. I'd probably purchase a used 27 inch monitor for the Mini.
Should do the job -
personally I wouldn't go over 1TB internal storage on a desktop Mac when external storage is so much cheaper (and even USB3 is fast enough for your purposes) - that's more than enough working storage for most purposes and you're going to want external drives or NAS for archive/backup anyway.
Issues with waiting for M2 updates aside, have you thought about the 24" iMac?
My opinion:
(1) I wouldn't "invest" in Intel Macs for personal/hobby use now unless I needed one for a specific job where the software either didn't work on, or wasn't optimised for, Apple Silicon. They won't be "obsoleted" for a few years yet but I suspect that many interesting new developments in the future will require Apple Silicon (we're already seeing "Apple Silicon Only" features in MacOS).
(2) Further,
right now I wouldn't "invest" in any M1 Mac unless I had an immediate "professional" need (i.e. old Mac had failed) since most of them - since the M1 is now 2 years old and M2 (or other) replacements are
probably due in the next 6 months.
(3) Apple's 5k panels (in Studio Display and old iMacs) are things of beauty, but pixels-per-inch isn't everything and I actually prefer being able to choose from a wide range of displays (the Studio Display is there if you're willing to pay).