Made a few upgrades:
Memory - 64GB Crucial 2x32GB. Runs @2667 in slots 1 and 3. Slows down if original 4GB sticks are used.
External storage - 1TB using Cable Matters USB-C enclosure housing Crucial MX-500 SSD - 460 Write/525 Read.
My SSD is repurposed early generation pulled from a DIY PC. I tested the built in 256GB and others and decided that this performance is “good enough” for now. Storing all photos, music, movies.
* Built-in 256GB storage - 625 Write / 1400 Read.
* External MVME USB-C with WD Black 256GB - 204 Write / 825 Read. (Poor results might be SSK brand enclosure).
* External Seagate USB-3 2TB spinner hard drive - 119 Write / 124 Read.
Happy with iMac and with great Prime day price for memory (64GB @ $168). With reused 1TB SSD and reused HD monitor as 2nd monitor in portrait mode it’s a real workhorse for just under $2k new outlay.
iMac is replacement for 2014 Mac Mini, but I also traded in my mini for new 2018 Mac Mini (2nd tier i5 w/512GB). Apple gave me $190 trade value, easy transaction started online and finished with pickup by appointment in Apple Store. Planning to upgrade memory in new mini as well.
FYI “Mauka” is towards the mountains, commonly used in Hawaii as location direction.