Also outside the video aspect the HTPC should fit in with the rest of the audio video components. A nice case by Cooler Master or Silverstonetek or Ahanix would nice fit with the rest of the components.
http://www.coolermaster.com/index.php?LT=english&Language_s=2&url_place=product_class_include&files=chassis.html
http://www.silverstonetek.com/
http://www.ahanix.com/
Sound is important so having a low noise power supply or fanless power supply is a must.
http://www.thermaltake.com/purepower/menu.htm
You would also need a sound card unless built into the motherboard that can output SPDIF to your receiver to get the full DD DTS. Don't foget to get a low noise hard drive like Seagate Barracudas or like in my case I buy low power low noise laptop hard drives.
