You might also have a look at Sony's MCR-1K, which also connects to the camera thru Firewire and records to Compact Flash cards. I use 32Gig cards in mine, and that gives me 2 hours and 20 minutes of recording in AVI format.
The specs say you get that amount of time in HD, too, but I don't know that for sure, since we don't have an HD cam.
The list price of the MCR-1K is about $600 less than tht of the FS-H200.