Encrypted partitioning

Hello.

I plan to encrypt some folders before installing openSUSE 12.3 With KDE, LXDE and XFCEon my new drive (size suggestions taken from here). My plans are:

* Unencrypted (since I can't encrypt it)"/" partition (40GB, personal choice because FlightGear itself takes about 20GB)
* Unencrypted /boot partition (300MB)
* Encrypted /var partition (8-12GB)
* Encrypted /tmp partition (This one it says 50MB but I think it needs more space)
* Encrypted /home partition (Around 250GB, my personal choice)
* Encrypted SWAP partition (4GB)
* And another encrypted data partition (The rest of my 1TB drive)

Should I be safe with those numbers? Should I encrease some of them?