SB Live! card is how old?
Might as well get something in the Audigy 2 line of cards.
don't get the audigy se though, its just a rebranded sb live.
I just got the z-5500s in the mail today ($150 from amazon on black friday.)
They're ok, but the headphone output leaves a LOT to be desired. They can't even properly power some mid-range senns.