ASUS Xonar DX ($89.99) or HT Omega Striker ($89.99). Blows the old ExtremeGamer out of the water, quite frnakly.
My list of recommended cards:
ASUS:
Xonar DX
Xonar D2/D2X
Essence ST/STX
Auzentech:
Forte
Prelude
HT Omega:
Striker
Claro
Frankly, the Claro (HT Omega) and Essence ST/STX (ASUS) are the best soundcards on the market, bar none (with the Prelude not that far behind). The Striker (HT Omega) and Xonar DX (ASUS) take up the budget space, beating pretty much everything in Creatives arsenal quite handly.