storage area network - Which RAID level for virtual machines in SAN

I have Dell EqualLogic PS5000E iSCSI Array. I have connected this SAN in servers
directly. I used Jumbo Frames. In this case, everything is ok.
My storage is ~25TB. Now, I need to choose, which RAID level I
have to use. SAN proposes only 3 levels: 6, 50, 10. I have 16
HDD-s with ~1.8TB per each disk.

Which RAID level can you advise for
virtualization and for work with databases?
Also, better to configure two
raid levels. But SAN creates only one
default storage pool with all our disks. If you know another
way to configure two arrays, it will very nice

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