Streacom BC1 V2 Titanium
I picked up the BC1 V2 Titanium as a dedicated test and open server rack and it's been exactly what I needed. The build quality is immediately obvious the aluminium feels solid, the anodizing is flawless, and there isn't a single sharp edge anywhere. Assembly took me maybe ten minutes on the first go, and now I can break it down and set it up without even thinking about it. The thumb screws are a great touch.
Swapping a motherboard or GPU that would take 20 minutes in a traditional case takes a fraction of that here. Everything is accessible, nothing is in the way, and the adjustable mounting points give you plenty of flexibility.
One small hiccup: the included screws didn't fit my power supply, so I had to grab matching ones from my own stash. Not a big deal if you have spares lying around, but worth knowing ahead of time. Other than that, I have zero complaints. It's one of those products that just works the way it should.