Help with partitioning

I just want ask about suggestions how to partition hard drive. Hard drive 500GB. I plan to put on it:
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1) FreeBSD in future as hypervisor for Linux (if possible), but also to learn 2) Slackware - experimental in future with root / on overlay 3) file exchange partition - ntfs

I would like to follow our BDFL recommendation to use separate partition for /boot. The limit of four primary partitions is little pain. So primary partitions would be
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1) /boot 2) freebsd 3) linux 4) ntfs

and plain clearly there is no swap partition. So let these be primary
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1) /boot 2) freebsd 3) ntfs

and linux as extended. But I don't feel particularly comfortable to put swap inside extended partition. What do you think?