RAID 0/RAID 5???

Hi.
I bought two brand new HP/Compaq ML370 servers with 4 SCSI disks each and a
Smart Array Controller (hardware for raid capabilities).

With my old servers I had RAID 5 with a similar configuration so I was going
to configure the new servers with the same mechanism, but the Compaq agent
that installed the new computers told me to use RAID 0 because it is safe
enough and save lots of CPU+hardware resources.

The obvious fact is that RAID 5 is SAFER than RAID 0, but now I'm a little
bit confused by this guy's suggestion.
So, what do you suggest? Each server will hold an instance of SQL Server and
IIS Server.

Thanks in advance,
Kirsten


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