I have the same motherboard with a 5200+ cpu,lite-on BD, WD640gb and Antec 2480 case.Playing Blu-ray through powerdvd and enable hardware option gives very good PQ. Have to use the ultra version for DTS and Dolby Digital sound though.
http://www.custompcguide.com/ultra_budget_htpc.html
http://arstechnica.com/guides/buyer/guide-200804.ars/3
Some url to htpc reconmendations