I want something, with somewhat thick sides, that I can paint and cut up if the desire hits me. The cheaper the better. Links to reputable sites would be above and beyond.
I have done builds with a couple of the $20-$30 rosewill cases from newegg. For a cheap steel case they are very sturdy. The frame is the same on most of them just the side panels and front are different. I would take a look at them and see if there is one you like.