I say it's riskier because the chance of data loss is doubled but it's still worth it to RAID.
Do you mean use two 250gb 10,000rpm HDDs for RAID 1? If not can you explain more what you mean. ThanksThe risk is more because you have two drives that could fail and wipe out all your data instead of one.
Why not use a smaller FAST drive 10,000 rpm like a Raptor and use the two 250's as storage in raid 1 that way your data is backed up automatically