Rarest/most valueble item you own

Krelian: Nice to see you around again, and congrats on the soon-to-be fiance! And if she ever gets the notion to sell her Lunar: SSS, I'll pay more than the Software Etc. bums would! :smt040

As for me, I really don't own hardly anything rare, most of my stuff is fairly common. I suppose my Pc Engine Coregrafix is probably the most rare thing I have, and that's sad. Or possibly my Dreamcast Nakoruru Limited Edition set (although to be honest, I'm not sure if there was a regular release) or my Border Down Limited edition, and that's it. I'm so sad.... >_<