In fact, I did not decide yet.
G-tech : their forum is full of people having repeated problems.
Sonnet : seems pretty reliable, especially because it's intended to DV.
OWC : they seem reliable too, with several RAID 1 systems.
I recently revamped my backup/archive situation. Using a MBP as the cpu forces me to use an external drive and have been using a firewire drive as a backup. With the pile up of large image files it was time to upgrade the system and add redundancy.
After a bit of research I decided to not go with a RAID. but to set up a dual drive enclosure as distinct drives. Picked up the OWC Mercury Elite Pro 800 enclosure and two of the latest Seagate 7200 32MB SATA drives. OWC puts out some of the best engineered and designed equipment on the market, and this enclosure is no exception. Easy to put together, set up, and is quiet. The Seagate's are also pretty much bullet proof.
Each of the drives were partitioned for a bootable backup and the balance for archiving image files only. SuperDuper was used to copy the MBP's drive to the bootable partitions and the image files to the other partitions. When the external drive is turned on, all four drives show up on the desktop and I can copy as needed.
While this may be a bit more involved than a RAID, I feel more comfortable with having control over the process and not being at the mercy of a proprietary hardware/software situation. The external dive is only powered up at the time of copying , further lessoning the chance of it being taken down by a catastrophic failure. Superduper also lets you do scheduled backups if desired.
So now I have two bootable backup drives and two distinct copies of all image files in the enclosure. I also have turned the old firewire drive into a third file archive to work from, allowing me to leave the other two untouched. The only image files on the MBP are just the current projects and now the HDD has plenty of headroom.
Not as easy as pushing a button, but I sure do sleep easier now. Anyone who's had a bunch of stuff go up in smoke, never to be seen again, knows what I'm talking about.