I've been looking on LaCie's site and reading through the manuals for the 7xx series of monitors. They all have full manual control of color, brightness and contrast. Meaning, you can properly profile these monitors without having to rely on DDC. You just have to do a bit more work to manually set a white point and other settings in a third party profiling software package.
Try the
ColorEyes Display Pro software. It will work with the LaCie colorimeter as an Eye-One Display 2.
If you want to try the Colormunki, turn off its default setting to use DDC with
this download from X-Rite. It comes with two items. One to turn Colormunki's DDC support off, and another to turn it on.
The tools and software to properly profile these monitors is available.