Geoff,
Now, you are all over it. I knew you were there, lol. No offense to George, I can't imagine a RAID0 unless you are combining for a RAID10.
RAID1 and RAID5 is a bit over the top. Ironically, I now have RAID5 and some would go with RAID1. RAID1 has a bit more redundancy and less efficiency but RAID5 is faster with less redundancy. My new system is RAID1 and RAID5. I don't think you can go wrong with either. But, RAID0, yuk, unless you are as thorough as George with his imaging.
@ Jen -- completely disregard this RAID talk. It is probably a bit over your head right now. But, it is good to get. So talk to your IT guy. And, as you can see, three people will give you five answers, lol.
@ Geoff -- glad to see I wasn't reading it wrong.

You're the best.