Actually my rarest DVD is the out of print, Region 2 original pressing of True Lies. The original release used the uncut master by mistake, this was quickly recalled once the error had been realised, and was replaced with the UK cut version. I managed to pick up the uncut version from eBay for about £6.00.
i've got this as well. i also have the original bridget jones dairy before they recalled it to censor the commentary. the original Rocky collection with the PG cert and signed copys of Dawn of the Dead by Romero and Cabin Fever by Eli Roth
Akira R1 tin version
The Phantom Of The Opera delux boxset with full bitrate DTS sound (limited to 2000)
and some cool laserdiscs