The most expensive is the prettiest and the highest resolution. The least expensive is the lowest resolution but only negligably less pretty than the mid-range panel.
No surprises.
The 2160x1600 and 1280x800 panels came from one supplier who was much more high-communication, and also got the shipment to me twice as quickly as the other supplier.
Lcd panel sourcing, next steps
Come Friday, I will be sending an inquiry to the supplier of the 2160x1600 panels and asking for a quote on 100 panels with (a) hdmi driver boards and (b) hdmi+usb-c+usb-c driver boards.
I'll ask the same of the 1920x1080 panel supplier.
Expect a report back as data becomes available.