The audio rating on the Hi-Fi series of mobo's dubbed by Biostar are limited tot eh analog outputs off of the mobo. You'd need to go for a GA series of mobo's that have support for Dolby technology. Asus also have a few mobo's that have full Dolby support.
A word of caution however is, if you're going for a mobo that has THX support, be warned its only software upmixing/amplification/altering. Nothing on the hardware level.
Thus my agreement of alvine+chesters idea of going with a good mobo(which has all the features[bells+whistles] you'll need) and an audiograde soundcard.
HT | Omega?