Hi Steve,
There is no DA7 to firewire interface like there is for some newer boards (DM-24, Mackie Onyx).
You can still use the DA7 with a Firewire audio interface though. You could go with a MOTU 828 or 896. I am selling my MOTU 2408 and am looking at a Digi 002, althogh the lack of wordclock leaves some questions to be answered by the folks at Sweetwater.
I would reccomend a MOTU 2408 or RME interface, althought they require a PCI slot.
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Ed Roman for President