Best way to explain the importance of Raid 10 to SysAdmins
This is just a reference. A great session recording at SQL PASS Summit 2011 by Wesley Brown on this subject. It is an hour and 15 minutes of just storage talk. He goes over RAID configurations and then how they pertain to SQL Server and the pros and cons of each:
Understanding Storage Systems and SQL Server

You will need to register with SQL PASS in order to view it but it is well worth it. To find the recording go to this link and look for course "DBA-103". I don't think the same slide deck he uses is available for download but he posted the deck used at a few SQL Saturday events here.