What is a PVR system?
Personal Video Recorder--Stick in a TV tuner card and the PC can work like a Tivo device. I was going to use the ASUS TV Tuner as it comes on a low profile card and also add in an ASUS GF4 MX440 that also comes low profile and with TV-out.
Then I'd say the Lian-Li PC9300 USB is a nice case if you like the design. It isn't low profile though.
I've removed the HD-led and put in the IR-receiver instead. The IR-receiver also had a led which would flash up when using the remote controll. I cut it off and connected the led in the blue stripe so the blue stripe lights up when using the remote controll. Today the Matrox Orbital LCD display with blue backlight came, so when I come home I'll see if it fits
I haven't settled on the fan layout yet, as I'm waiting for a Seasonic PSU to replace a Fortron PSU with loud coil buzzing. But I think I should be able to get a very quiet system. I think I'll use a two or three fan setup.
Also, I bought a ATI 9000 card because I thought it was fan-less. Later I found out that the Pro versions has a fan, so I'll have to see how to solve that. I have some ideas, but I want the system up and running before I try.