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SCSI drives tend to have better specifications lifetime wise, since they are deemed for professional rather than home use.
RAID 1 is good if you can afford to lose 50% of the total space, it'll often speed read performance, but will slow down write times, buts its a complete mirror so its a lot safer.
RAID 0 is only for speed and isn't a true RAID system, and won't offer any safety, in fact its worse than just having one drive.
RAID 2,3,4 arent all that useful, as they are inefficient , RAID 5 being the more popular for servers, but you need 3 drives minimum,a nd its complex to rebuild on a fault, unlike RAID 1.
beyond that the levels of RAIDs are really for servers and professional users since they require a lot of drives.
Two IDE's + a raid controller might be a better solution than a more expsensive SCSI drive with controller, depending on what you have now. I think RAID 1 is probably the best for someone looking for most data protection and home use at the cost an extra drive..
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