I installed FreeBSD 10 on a Sun Microsystems UltraSparc Creator 3D workstation that I got for $30. OpenBSD wouldn't work, something about a bad magic number or something. Anyways the NVRAM had a dead battery so I couldn't get it on the internet because it couldn't register a MAC address which is stored in the NVRAM. I read an article about soldering the NVRAM with a new battery. Replacement is like $70 for a new NVRAM. So it's in the basement for future projects.
That aside I have about 2 or 3 PowerMac G5 silver towers ($50 for a dual 2.3GHz) that I want to install FreeBSD onto. I've read that this is the way to go with those things. I'll experiment with it this summer.
I think if you're going to go BSD go OpenBSD, but really these are for different purposes. If you need to have drivers for video cards and for multiple desktop environments use FreeBSD. If you want nothing to work, no drivers for video cards, etc but a secure environment then use OpenBSD. I mainly use Parabola, Gentoo and OpenBSD. Different use cases for different jobs. I ultimately want to migrate my linux experience to something like Source Mage evenutally when I have more time to spend reading and installing/fixing computers. But I'm too busy with school to change gears right now.
FreeBSD friends post your security tips here in this thread. Links to articles and tutorials about FreeBSD security and other helpful tips are also welcome. Thanks for starting the thread OP.