HD-SDI uses professional locking connectors and inexpensive, widely available cable. HDMI has consumer oriented, non-locking plugs and cables will actually be more expensive if you need to make a longer run. I have the HDMI only version of the DP6 from SmallHD and it works great with the output of the Panasonic GH2. I’ve actually never had a camera that outputs SDI, but my Kona card does output HD-SDI to my Panasonic broadcast monitor. Basically, anything with HD-SDI is going to be more expensive, but probably more robust. You have to decide whether or not it is worth it for you.
Jason Jenkins
Flowmotion Media
Video production… with style!