Well, now that I have been using the drive, on an almost daily basis for this month ( the drive arrived around the 7th ), I can give in some feedback I got the tripple interface rugged Lacie drive, a 160Gb unit runnint at 5400rpm.
Honestly, FW400 is faster than High Speed USB 2.0.... but not enough to make up for extra bucks. They perform quite similarly, and if someone doesn't plan on having FW800 around in the future, go for USB2, as long as it's High Speed USB 2. In a 20Gb transfer, I experienced something around 1 minute of advantage towards FW400.
Now, FW800 is another issue, it's really faster, and you can really feel a diference when transferring large ammounts of files. I do plan on having a MacBook Pro before this drive is tossed into the bin, so, I can still have use for the FW800 interface, or at least, for the Lacie casing, replacing the drive ( which voids warranty ). So, I don't feel I made a bad purchase.
About the rugged nature, I can't still say anything. Regardless of the "90cm drop" claim Lacie does, I won't intentionally drop it to see if it survives. It does handle some rougher treatment, but that's all, since my data is inside, and I use it as a mobile backup unit for not having my work only on the notebook HD, in case of theft, faillure or accident, I do treat the HD with care. But less care than I would treat a non-rugged HD, I'll admit that. I must say, the unit is well cushioned, and it's hard to think of any fall where the " orange bumbers" wouldn't take the hit, other than the drive itself falling over a wedged surface, alluminun case side down.
Thanks a lot for helping me select this drive, everyone. Right now, I'm very happy with my purchase, and if something happens, I'll try to come back here and leave all feedback. I do hope this feedback will help you