Well, after a few hours of thinking about this, I finally remembered that I sold my 670 locally to a friend.
So, I think I will borrow it and use its pre's (while they ain't great, they'll do the trick).
But now I am left with another thing to think about:
Should I send out a digital signal and use the 670's ADC?
Or, send an unbalanced line out and use the 744's ADC?