RAID5 get spenalized slightly for writes. For the real deal on RAID see e.g. http://www.storagereview.com/guide2000/ref/hdd/perf/raid/index.html
For SQL on local drives I'd go for RAID1 OS, RAID 0+1 LOG and RAID5 DB for a transactional system. For a data warehosue system, I'd put the logs on RAIFD1 and the DB on RAID0+1 and a lot of spindles. But then agian, most of our stuff ison a sAN anyway, thus RAID doesn't matter much anymore at that point as it's abstracted.
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