Lancool 205 Mesh seems to have the same design.
In fact, I think it's better without the circles on the H510. Just a pure mesh. Although I'm not sure whether it'll look good when you can look straight into the case through the mesh, especially with RGB fans. Still, I prefer a clean mesh to something with huge holes like the H510 or Corsair 5000D Airflow. The H510 also doesn't do top-facing watercooling, which I might look into in the future.
Colour is black. Budget, below £100, preferably below £75 and as low as £60 (although the cheaper the better). I'm looking to replace a Bitfenix Prodigy, so I want to maintain that solid steel build quality. Preferably thumbscrews on the PCI slots. Not interested in glass, but it's hard to avoid nowadays, and I won't pay extra to avoid it.