Ok, well I decided to get the Asus M3A-H HDMI and an AMD 4850e CPU.
I installed the motherboard in a Thermaltake DH-101 Case with 1 x 160 Gb sata2 and 2 x 1Tb sata2 drives, 2gb DDR2 ram, WinTV 150 MCE tuner card and a 450W power supply.
The case fans are quiet enough to not be heard during movie playback.
Installed the operating system and drivers without any problems. The bios gives plenty of options to choose from and has been stable so far.
Installed 1 x LG Blu-ray/ HD-DVD combo drive with Cyberlink software, also installed ffdshow to allow playback of different media formats other than mpeg-2.
Plugged HDMI to my Pioneer amplifier which picked it up straight away, audio is run via digital rca out. Getting both video to screen and audio to amp with no problems.
Using a Harmony 880 remote to control the media center, works great.
I still have some things such as setting up the PVR and getting MCE to play Blu-ray without having to minimise and run PowerDVD.
Overall am happy with this setup.
Paul.