I'm sick of concerts being in Zoetermeer or Tilburg.

Amersfoort is in the centre of The Netherlands. It's an important junction for public transport. So travel time is immensely reduced for a lot of people in the North/East.
Here in Amersfoort we have a venue called "De Flint" (not too far from the train station).
They have two stages:
-
"Theaterzaal" (translates to: Theatre Stage, a seated audience)
-
"Stadszaal" (translates to: City Stage, a standing audience)
both with a capacity of at least 800 visitors. So it's a bit bigger than De Boerderij.
The "Stadszaal" is probably better suited for bands (it has been used by other bands before), while the "Theaterzaal" is more like something for Caamora or Alchemy, I guess, but who knows.
Then there's also a smaller venue called
"De Kelder" (even closer to the train station).
They have one stage with a capacity of 350 visitors.
Anneke van Giersbergen (ex-The Gathering, Ayreon, Devin Townsend) is doing a gig here in March, as she had done in the past.
(Just to name a familiar international artist)