Well, really any cheap case will do for a desktop rig. Check
www.casedepot.com for a mid-tower case in your budget range.
As for flat-panels, NEC/Mitsubishi make awesome panels, so do Sony and maybe Planar. But even the best LCD's will ghost and streak, the severity is what seperates them.
What really will kill LCD's is OLED technology. Streaking and ghosting are absolutely nonexistant, their cheap, and they can be bent and rolled up like newspaper. Stay tuned for this stuff, folks, you shouldn't regret it.