Creative Audigy 2 Value
The Creative Audigy 2 Value, also sold as Creative Value LS, is a fairly decent budget soundcard. Creative's page can be found here: http://au.creative.com/products/product.asp?category=1&subcategory=205&product=14189
Be aware this link will most probably expire when the card is no longer current.
The card seems to work fully in LinuxMCE, although there is some configuration to do before it does. On initial installation in both 0704 and 0710 Beta 2, Appserver would not start up. As a result, Myth would not work. The problem seems to be that Appserver tries to access a sound mixer device upon startup. This card does not have one, and Appserver exits with an errorcode of 139. To fix this issue, install a software sound mixer.
For more general detail on installing the software mixer, see: http://alsa.opensrc.org/index.php/Softvol http://alsa.opensrc.org/index.php/How_to_use_softvol_to_control_the_master_volume
For more specefic detail, see the link off this page: http://www.pillayfamily.com/LinuxMCE/index.html