Unless you are doing it for the sake of doing it, then RAID isn't really worth it for a home user unless you go with mirroring for data redundancy.
Striping is fancy and all, but you double(well actually more than double) your chances of data loss. I already covered mirroring. And, striping + mirroring is simply too much for a home user.
Unless your home use consists of hardcore(no, not *that* hardcore!) video editing, you'll never really take advantage of the speed increases of RAID. The mirroring is nice if you really need to back up that much data, but backing up to a HD isn't exactly a smart way to go either.
Just an opinion from a non-enthusiast who follows the "Keep it simple stupid" school of thought.