Portable HDD with USB and FireWire

Alright, I did a bunch of research and found a bunch of conflicting information. My question to you all is this: are there any good, portable external hard drives that support both FireWire and USB? I have an iMac and an MB Pro, but a lot of people I know don't; I would like to use the FireWire and still be able to use the hard drive with others' computers who do not. I was looking for something that:

• did not require an actual electrical plug (wanted the USB/FireWire to be used as the power source)
• is at least 1TB (would prefer 1.5TB)
• is (preferably but doesn't have to be) rugged

I plan on doing some traveling and whatnot and just throwing it my bag; I'd probably go a while without having a chance to really maintain it, hence my wanting these things.

The main ones I was looking at are the LaCie MiniRugged, LaCie Rugged, Transcend Storejet 25H2P and 25M2, and the Seagate FreeAgent GoFlex. Unfortunately, I've either heard bad reviews or they don't meet all my criteria. The LaCies, for example, were said by some to be outdated, flimsy, etc. (and the mini doesn't have a FireWire port). The Transcends don't do FireWire, nor does the Seagate. In case anyone was wondering, I included the Seagate becaue I have a friend who just got back from a year-long trip bumming around Asia with it and it stood up fine (but, again, no FireWire).

Given all this, I was wondering if anyone could suggest anything. I realize I may not get exactly what I'm looking for, so I'm not going to be super picky. Thanks in advance for any help anyone might be able to offer.