I am currently buying a new sound card and did read a lot of reviews. Sadly there is no professional review for the Terratec Aureon 7.1 PCIe card. It's price range is only slightly above the Asus Xonar DSX though and past Terratec sound cards were reviewed to have better sound quality then even the best creative sound cards.
Maybe you can get very high end sound quality for a mid range price with this card. So maybe this is worth a look for Tech Report reviewers?