That's a difficult one. If you're looking for a portable solution then I would look at the G-Tech G-Raid2 or G-Raid mini using Firewire 800. You'll be limited to Compressed HD as you will not be able to achieve uncompressed HD with firewire drives.
Just thought I would chime in. I just received an e-mail this morning from David C., Media 100 Product Manager indicating the HDPro has been validated with Media 100.
In the e-mail excerpt to CalDigit David said:
"Things are going well and we will approve these drives (HDPro) with Media 100 and Tiger. We will update our website with information too".
Once Media 100 supports Leopard, CalDigit fully supports Leopard with the HDPro.
If you have 2 passive 4 lane 1 port cards, you can go between 2 systems, sneaker net style with our HDPro, True Hardware RAID product. One card comes with each complete CalDigit HDPro product, and additional card can be purchased for $299.00 MSRP. With this setup you can easily edit Uncompressed 10 bit 1080/60i 4:4:4:4