Partitioning of new machine

["B. M." <b-misc@gmx.ch>]

Hi all,

While I'm waiting for the components of my new machine (testing/jessie)
I'm thinking about the optimal partitioning scheme which should last for the
next 10 years :-)

The system looks like:
Haswell 3.4 GHz
8 GB RAM (later upgradeable up to 32 GB)
250 GB SSD
2 TB HDD

What do you think about the following:

=== SSD: ===
/boot           unencrypted, 300 MB
/               ext4, encrypted, 25-30 GB
/home           ext4, encrypted, keyfile, 220-225 GB
  User data for two users


=== HDD (in this order for performance reasons): ===
/var            HDD, ext4, encrypted, keyfile, 25 GB
  It's so large because I want to add a directory /var/src below /var
  to compile a kernel on the HDD if necessary

/databases      HDD, ext4, encrypted, keyfile, barrier=0, 10 GB
  Used for the db's of digikam (1 user), akonadi and amarok
  (2 users each)

swap            HDD, swapfs, encrypted, 5 GB (not hibernation)

/video          HDD, btrfs, 560 GB
  Subvolumes:
    /video/editing
    /video/series
  => for video editing or series, no backup, not encrypted

/data           HDD, btrfs, encrypted, keyfile, RAID1 (2 x 700 GB).
  With subvolumes for digikam archive, movie archive and music


What do you think (sizes, file systems, number of partitions, ...)?
Is it still a good idea to put /var on an HDD, not a SSD?
Video editing is currently not required, it's more like an option for the
future (1y or so) and might require a second HDD (source and target
drive for rendering to increase r/w performance).
To keep it simple and usable I'll use keyfiles for all partitions except
/.

Thanks for your inputs and all the best.