@beegrrl My first BSD was Dragonfly. But my favourite is NetBSD, which is what my Pi currently runs (er, it would, if it were plugged in...gotta run cable in my new place, etc etc).
I love Illumos. I have an OpenIndiana install on my non-work laptop. I did a little (very little) Solaris admin at an old job, and I quite enjoyed working with that system.