Vince,
Here's the page that lays it all out for you.
http://www.nemesysmusic.com/support/hardware.html
Down and to the right is all the technical info on each card that's GSIF-compatible.
Since I'm a huge RME fan, I'll chime in with the 96/8 line, PST version probably. Lists for $570, but I know a place (THANKS Yavuz!!) that sells at a good discount. No tax for you since he's in CA and you're not.
http://www.rme-audio.com/english/index.htm
Mark