Don, I know this is off topic - but what rare decks don't you own?
There's quite a few. The White Cents, Jerry's... I don't own any decks supporting tobacco (Marlboro Texan 45s, RJRTC "Watermelon" Bees) or alcohol (JAQK Cellars, Virginia Slims). It's a personal thing.
I own very little vintage, and not that old. Two '60s Empire Arrcos and 17 packs of bridge-sized airline decks from the '70s.
I don't own S&M v1-4, just 5 and 6.
I didn't buy the Bicycle Apollo deck! Nor did I buy Bicycle Tattoo v2!
Rarest deck I possess is a pack of Broken Spell, by Jisuk Cho. I have only one, had to get it through an auction by the artist to raise emergency funds for Japanese tsunami relief. There's well under a thousand in print, but I don't know exactly how many. And yes, I opened it! Next rarest would be two recently-acquired packs of White New Fan Backs.
I plan to photograph my collection on display soon. Last week I posted a display of one pack each of all the decks I own. Let's see where I can find that topic...
http://aethercards.com/discourse/index.php?topic=99.60Go take a look and you can tell me what I don't have!
I hope to take an inventory of the collection soon.