Nice review !
So I think comparing hard disk in RAID array would be more representative for server usage. Overthemore it shoud be interesting to compare RAID and none RAID performance depending on hard disk usage (server or single user machine). Today RAID is more and more accessible to none professional constumers and is now integrated on some chipsets.
I'm a in the cathogory of power users, I use a 3ware 8506-12 with 250 Go Samsung spin point Hard drives in RAID 5 array and I would know if my controller will provide good performance with such hight speed SATA drives like the Western Digital Raptor WD1500 or if I should upgrade to 15k SCSI hard drives
I hope other bench in RAID array...
PS : sorry for my poor english (I'm french)