You dont say how many inputs or outputs you need, for external sound cards i would go with a firewire one, USB2 is ok for 2 / 4 channel recording but when it come to multi input recordings firewire wins.
You could look at Edirol FA66 or FA101 or MOTU 828mkII or Presonus etc
The list is big, its down to how much you want to spend and what you need it to do.
Bookmarks