I just got here, trying to solve a similar problem.
after a lot of research, I got to his thread, and looks like i'll keep the old and beaten PC... with a firewire port!!
My company has acquired one Mac Pro, already with OS X 10.4.4, and a Blackmagic DecLink Ultra Studio Express. Still waiting for the Adobe CC licenses...
Next year we're buying new cameras, but for now it's up to the old Canon XH-A1s to do the trick.
We also have a Sony HVR-M15AE deck and loads of HDV tapes do digitize!
Is there really no other way to connect that hardware to the Mac Pro? (than to digitize it on the PC, then transfer it to the Mac)
P.S.: I'm reading the manuals... desperately!