Depends on what you're using it for? Personally I feel our data is irreplaceable and I would NEVER put it at risk running a RAID 0 system. I know it's 4 times the cost of the Lacie drive but you should
CHECK THIS OUT
It's a 1TB SCSI RAID 5 solution so your data is never at risk if a drive fails. If one goes bad just pull it, insert a new one and all your data is rebuilt by the 3 remaining drives. Also, you won't find anything faster or more reliable than a SCSI drive. I use ours for video editing and storage of all our files, everything!
I guess you have to ask yourself, what's your data worth and what would you do if you lost an entire TB of your data because a single drive failed?