I despise Creative as a rule and will never provide them with another dollar, but the Audigy 2 has pretty good DAC's by all accounts, even better than the TBSC (barely) which carries a special place in my heart. The sound quality is superior to their other cards by a signficant margin and better than all onboard systems (though just barely in the case of the Asus nForce2). If you want to get the best quality analog out though, ditch the mass market crappy sound cards and pick up something from M-Audio. The Audiophile 24/96 has always been hailed as the best sound card short of a pro board out there. They've since added the Revolution which provides equal DAC quality (some say better...) plus a host of other features at a price comparable to the Audigy 2 (maybe a bit less).
If you can sell the Audigy 2 or return it, you can grab a Revolution here:
http://www.midiman.net/products/consumer/revolution_page1.php
BTW, it supports 7.1 DVD audio if you watch movies on your computer.
