What Cases Work Well For Building Set-Top Boxes?

magnitron asks: "I'm interested in building my own set-top box like TiVo et al, but adding DVD support and the ability to surf the Web. I have looked all over the place for a decent case that will hold the ATI Radeon All-in-Wonder (this is the heart of the system). The nice and small cases usually have a real small power supply and proprietary motherboard (No AGP). I really like this one, but need it gutless and want to upgrade the motherboard and power supply. Anybody know where I could get a small case that would fit a 250W power supply, a DVD drive and an ATI AGP card in it?"