Another opinion -- if you only need the soundcard to perform bit-perfect digital transfers from your dat>computer, and already have a jb3 and firewire card . . . unless you're planning on transferring a LOT of dats, you might want to consider just using the jb3 as the dat transfer device and skipping a new sound card alltogether. YOu indicate you already have a d8 with an optical digital cable. WHy not just go d8>optical>jb3 and then transfer the shows from the jb3 to the pc via firewire. Although this requires an extra step, you don't need to worry about leaving your pc alone (or dealing with configuration issues) to avoid dropped samples, etc. as you would going dat>pc.
Further, sample rate conversions, etc. are not an issue when playing stuff back via your computer's cd drive and then through your pc's speakers, etc.