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If you are going with Linux, I would go with the 3Ware card.
3Ware always has, and probably always will support Linux extremely well. The 3Ware card series is probably better supported on Linux than most SCSI RAID cards availible.
If you set it up correctly in Linux, you can have your RAID-5's act as single drives, and then turn them into a striped software-raid, so even though the 3Ware card might not support expanding an array (which I don't know if it does or not), you can expand the cluster directly in linux (using either LVM or MD, I'm not sure which is the best option nowdays).
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