The G-Tech drives are great. I own two of the Q (fanless, convection air cooled) models. They are built rock solid, and have fast interfaces. Another photographer/friend of mine who shoots still-life owns four 1TB models. Actually, we were just chating about them today. He said he got rid of all his LaCie drives, which he used religiously, because of continual quality control problems and crashes. G-Tech cost a bit more, but seem to be truly well made.
I also have the Drobo Gen2 model. Seems to work flawlessly, and now that it has Firewire, is moderately fast. I actually use it as a network drive for all sorts of things, though primarily redundant backup for my G-Tech drives, as well as other backup and archive purposes.
I don't think you'd go wrong with either solution.