Everyone already has the right idea -- I just want to add my +1. G-Tech drives are great, better than LaCie and WD. I even tried a Glyph but sent it back and got two G-Techs. I use a G-Tech G-RAID mini. It's great over FW800 and especially portable because it uses bus power. It has a rugged design and even a little fan on the bottom to keep the drives and controller cool. I have a G-SPEED Q for my primary storage. It's built of an insane 1/8" aluminum one-piece body. I'd recommend any G-Tech drives, but the G-RAID mini and G-DRIVE mini are bus powered so you should get one of those. I think G-Tech also makes a few external SSDs.
G-Tech drives are especially cheap at B&H,
http://www.bhphotovideo.com/.
I read a lot of bad reviews about LaCie drives. The controllers would fail at a pretty high rate. I didn't like the Glyph drive because the warranty wasn't worth it with a RAID 1 set and the build quality wasn't as good as the reviews say.
As for use, I don't do video, but I do audio and graphic design. The drive is definitely as fast as FW800 will allow. It even has an eSATA port, which you probably can't utilize, but it's there and it works.
There are some budget options out there, like OWC and a bunch of plastic enclosed drives on Newegg and Amazon. Some get bad reviews; some are probably as reliable as the disks inside. G-Tech is not the cheapest option you can find, but I can say I've tried them and have been satisfied. They have a great warranty and since Hitachi owns G-Tech, you get a little discount on the disks. It might cost 10-15% more, but you get some piece of mind.