I'm on the verge of putting together a linux workstation based on the Xeon E3-1245 and Asus P8B WS. Basically for Monte Carlo simulation and some data analysis (there may be a Tesla card later if things go well). I'm looking for a full tower case with enough room to fit a boatload of drives and a couple big video cards, but also is toddler-secure.
I work at home, with two little toddlers who love blue LEDs (i.e. power switches). I was looking at the Corsair Obsidian 800D, but the hot-swap drives on the front are too accessible. The 650D looks good, as does the Fractal Design Define XL. However, neither of them have a door lock or lockable power / reset button.
What are the recommendations for a big case that can be secured? The office door is shut, but I don't lock my kids out.