Hello,
Excellent question. I own an independent Apple consulting company here in Florida where many of our clients ask the same thing. Two factors to consider - price and value of your data. If your budget will allow, there is no better solution than G-Drive. they are not cheap, but have the best design, internally as well as externally. Very serious equipment here. If budget is a concern, Western Digital is also an excellent choice. We use these in plenty of installations as well. LaCie has always had a reputation for quality but honestly, we have seen an incredibly high number of failures with LaCie products over the last two - three years and we steer away from them. they notoriously lose power supplies... to the point, LaCie has given us spares to keep on hand 'unofficially', for when we are onsite dealing with a failed drive.
So, G-Drive first, WD second.
Hope this helps!