Hello, and welcome. why must it be asus? i know they are pretty
the thing is, you dont need a good motherboard really. motherboards connect everything to one another, but dont control sound quality. s long as you get a decent one for more than 50 dollars you will be fine. what you need is a good sound card! i recommend diamond link:http://www.diamondmm.com/xtreme-sound-7116-bit-sound-card-with-dolby-digital-live-xs71ddl.php
ok next i need to know what cpu you are buying to hook you up with motherboard.
Get back to me,