Don't buy 16gb ram from Apple as suggested in the thread. Buy the 8gb and add your own ram, it's extremely simple and much cheaper.
Also, maybe even 256gb ssd would be enough for you, and you can then use an external hard drive or ssd. Depends on what you use it for. But definitely buy the SSD, don't go for the fusion drive.
If you need a good deal, maybe go for the 2017 models, but the 4k 21.5 inch ones?