Guys, I am getting into this late but I have a great solution that has worked for me with my Z-1. I bought the Miranda AD/DA converter.
http://www.miranda.com/product.php?i=337&l=1
I go from the z-1 pre compression to the converter then to my IOHD via HD SDI. Then the IOHD to a MBP via 800 firewire while capturing Pro Res HQ to a 4 drive esata raid zero. Works great for me and no long gop! And has an HD SDI monitor feed.
Jeff