As hinted, it was purchased with little research, and importantly, without patience for an online order. I.e. I restricted myself to what I could find here in a store. It's an Asus RT-AC87U.
So far I use only a tiny fraction of the router features. But for what I bought it, it performed without issue, i.e. the traffic from 6 hosts with the mentioned 73 BOINC clients which I ran last week, and as a test a bunch of torrents too, besides web browser and radio stream. The control U/I has got a CPU and RAM utilization graph which is always pretty low --- I should figure out how to install BOINC on it to make better use of all this untapped hardware.
What I don't like too much: It's a bit big, it draws some power, it only has 4 GbE ports (which I use mainly; wireless only at rare occasions). There was no 8 port device in stock in town.
I'm not really interested in networking tech, which is why I went for a consumer oriented device instead of something semi-professional or professional. It replaces an equally consumer-level, but older and much lower-performing D-Link DI-604. (This is at home, not at the workplace.)
PS,
now that I write this post, I also browsed Newegg for customer reviews of the Asus RT-AC87U. A rather horrible picture is painted there, entirely unlike the German customer reviews which I took as guidance last week. Apparently this thing works much better east of the Atlantic than west.