13 drives

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What's the best setup for 13 drives? I don't need high performance (this will be mostly for archiving media), but very much do not want to lose my data. The drives are 18TB, and ZFS will be used exclusively.

MinFail: This many failures will kill the array in the worst case.
MaxTol: This many failures can be tolerated in the best case.

Name Setup Availability MaxTol MinFail Max Rebuild Perf
raid3z 10 data, 3 parity 76.9% (10) 3 4 100% + fail
raid3z + HS 9 data, 3 parity, 1 spare 69.2% (9) 3 4 92.3%
raid2z 11 data, 2 parity 84.6% (11) 2 3 84.6% + fail
raid2z + HS 10 data, 2 parity, 1 spare 76.9% (10) 2 3 76.9%
striped raid2z + HS 2x(4 data, 2 parity), 1 spare 61.5% (8) 2 + 2 3 30.8%
striped raidz + HS 2x(5 data, 1 parity), 1 spare 76.9% (10) 1 + 1 2 46.2%
striped raidz + HS 4x(2 data, 1 parity), 1 spare 61.5% (8) 1 + 1 + 1 + 1 2 25%
mirrored raid2z + HS 2x(4 data, 2 parity), 1 spare 30.8% (4) 6 + 2 6 46.2%
mirrored raidz + HS 2x(5 data, 1 parity), 1 spare 38.5% (5) 6 + 1 4 46.2%

14 disks might be more attractive; I work that out over here.