Solaris 11 is free to use, but does not get updates, afaik, unless you have a support contract with Oracle. That's how I understood it.
For my Home NAS, I'm perfectly happy with Solaris 11 11/11 (not Express).
Are you aware of the (acknowledged) bug in S11 where under some (not unusual) conditions, it frees up everything (or almost) in the ARC and refuses to use the ARC?
http://mail.opensolaris.org/pipermail/zfs-discuss/2012-January/050664.html
And you will not see a fix for this unless you shell out a thousand bucks or whatever oracle's ridiculous price is (or maybe in a year or two, they drop another free release...)
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