RAID-5 over RAID-1, with encryption

I'm planning to restructure my fileserver.  It has (well, will have) 8 hard drives for data, each 1.5 TB in size.  I want to create 4 mirrored pairs, and then place each pair in a RAID-5 array, for a total usable space of 4.5 TB.  I want to place encryption on top of it, with dm-crypt/LUKS, with either ext4 or xfs on top of that (_probably_ ext4, but it's easy to change that after I have the block devices set up).
I guess my questions are mostly about performance and best practices.
For reference, the server has 6 GB RAM (although I can easily buy more if needed), and a first-gen i3 (which, sadly, does not have hardware AES support).  The hard drives are all running off the motherboard's SATA ports, but I can buy (and probably will buy at some point) a good JBOD controller.
I should also say that the server will be used for (a) keeping differential backups of my other computers (probably only 500-750 GB in backup files), (b) streaming music / HD video, (c) torrenting.  So the usage is really a fix of access patterns, but the files should generally be larger-than-average (most files will probably be over 10 MB), and there will probably be many files open at once.
1)  What kind of chunk size should I use?  I assume using equal chunk sizes for the mirrors and the RAID-5 array would be good.  I was thinking 256 KB (which would yield a 768 KB block size in the FS), but that may be a bit big.
2)  I hear it's best to put the encryption between the filesystem and the top-level block device (which is the RAID-5 array in this case).  The other feasible option is placing it directly on the drives (well, on the drives' partitions).  Is this true?
3)  An alternative configuration would be to mirror two RAID-5 arrays together, but partial rebuilds would take longer and put more stress on the drives.  It would be nice to get some confirmation that I'm right in my reasoning here, and that RAID-5 over RAID-1 would be better than RAID-1 over RAID-5.
Any other advice with such a setup is welcome.
Thanks for your input!
(Note:  This was brought about due to the failure of a few hard drives in my fileserver.  To that end, I am unable to really test anything with all the disks until I get them back from the RMA.  I can still play around with a few disks for now, though.)

alphaniner wrote:α. BAARF
Yeah, someone linked me to that too.  I looked through their reasoning (well, about 3-4 of the links on that site) and I don't think it really pertains to me, because:
During a full rebuild (of the overarching RAID-5 array), one (or even up to three) more hard drive failures will not cause issues.
RAID-6 provided ample performance for me, so I assume RAID-5 will be the same (if not better).
Adding more hard drives would entail (a) a new controller, (b) a new case (probably a server chassis, to handle 10+ hard drives), and possibly (c) a new PSU.  So it's actually not at all cheap for me to buy them.
The reason I'm thinking of RAID-15 and not RAID-51 is because if 1 drive fails, the rebuild only reads from one drive (to restore that mirror).  If 1 drive fails in RAID-51, then the rebuild must read from the other 3 drives.  The situation can easily get worse with 2 failures, since this would cause reading from probably 2 but at most 3 drives in RAID-15, but would cause reading from all 6 with RAID-51.  Basically, recovering from a failure would take about 3 times as long, which means about 3 times the stress on the remaining drives while the array is more vulnerable.

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