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Personally I would go for ZFS with the SSD as a L2ARC. But among the options you listed I would do BTRFS RAID1 if you're only gonna use two HDDs, and mdadm RAID5 with BTRFS on top if using three.
What are the advantages of this over mdadm raid and bcache?
L2ARC will kill a SSD faster than normal wear would.
It will yeah, although with modern SSDs it really isn't a big problem. I've used an Samsung 840 EVO as L2ARC for 8 years now.