Going back 2 years when i was evaluating our options, Fibre Channel targets under OpenFiler seemed experimental, where Open-E DSS v6 was very simple to configure and worked.
Although Open-E still don't provide no HA for FC lun's and no multipathing options our direct attached storage.
NexentaStor Community Edition should be in your product considerations also.
It's NAS/iSCSI limit of 12TB of Used Storage so you can attach more.
As a free iSCSI server it's rock solid.
We tried both... Openfiler crashed several times, and didn't really support fiber channel. DSS has multi path IO supprot on QLogix fiber HBAs, and it's rock solid and easy to use.. it was an easy choice.. :-)