I think the 512 GB SSD is a good choice.
Recently I have been thinking that when I buy my next laptop, the SSD will have to be large enough to be able to store not only the system, but also all my working documents.
Previously I used an SSD only for system drive, but now I am reading it may be faster for your document files as well.
For that purpose 512 GB is what I am looking at, you will need to consider if you want to do the same, and in that case, if 512 GB is enough for both of these purposes.
About CPU speed: I would not spend extra money to buy the fastest CPU. In the last several years the performance increases of CPUs have been quite little. If I had to choose between:
1. 3.5 GHz CPU + 32 GB RAM
or
2. 4.0 GHz CPU + 16 GB RAM
I would always choose the one with more RAM and a bit slower CPU. That slower is maybe 5-10%, but the double RAM makes all the difference, because when you run out of RAM, all life on Earth stops, so to speak.
For a Revit guy, 4.0 GHZ would makes sense because most of its processes are single-core based, so single core speed matters. ARCHICAD is much more multi-core, meaning much less dependent on single-core speed, so it wouldn't matter for it as much.
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AMD Ryzen 1700X CPU, 48 GB RAM, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), WIN10 PRO ENG, AC20-AC26
Loving Archicad since 1995