I also recommend using the AMD Motherboards & CPUs.
I'm an idiot and I used the Intel stuff. It performs well but at the cost of increased heat and fan noise.
I recommend using an ATI Radeon HDMI graphics/sound card that does NOT have a built-in fan.
You don't need TrueHD & DTS-HD because DD & DTS are just fine. So you don't need the additional Sound card. One ATI Radeon card for both video & audio is just fine.
Get a PCI-WiFi card.
Get one SATA 7200RPM 1TB HDD (like Seagate Baracuda or WD Black).
Get a BD or BD/HD DVD ROM.
4 - 8 GB or RAM.
It would be more expensive, but getting a fanless chassis with heatsinks would be cool.
Software:
Vista64
Virtual Clone Drive
PowerDVD9
AnyDVD HD
DVDFab6
ImgBurn