Don’t know if ‘Holo Deck’ would count as a prop. Failing that however I’d go for a Tri-corder from Star Trek (with operator manual).
They seem to be able to do virtually anything.
The Bowie knife from The Iron Mistress
If anyone was about to mention:
Dr. Evil’s ring
The Billy Zane “Phantom” ring and belt
Antonio Bandera’s “Zorro” sword
Captain Kirks’s belt buckle from “Wrath of Khan”
The coin from “Pirates of the Caribean”
I have held the originals and the creators are friends of mine.
The bidding will now comence 
The hand-painted backdrop scenery that Sydney Laurence did for films back when he was a hungry artist. They’d be worth HUGE amounts today.
That’s OK. I’m pretty sure it’s broken anyway.
The claim slip on which Bogie scrawled “OK - Rick” from Casablanca.
A communicator from the original Star Trek.
The eponymous sword from Excalibur.
Morant’s slanted-side Australian military hat from Breaker Morant.
Aragorn’s sword Anduril from The Return of the King.
Daniel Craig’s cufflinks from Casino Royale.
Milton’s red stapler, from Office Space
Crocodile Dundee’s knife
The broken, crawling Terminator from the end of the movie
Someone already said the puzzle boxes from the Hellraiser movies so I guess I can’t have that.
I guess I’ll take Mustang from Bullitt.
The one with the magic regenerating hubcaps? That would be handy. 
Here you go.The designer sells some of the originals she made on her own site.
Me, when I was younger I’d love to have the mermaid costume from the movie " Splash".
WOOHOO!!!
I get the Ruby Slippers!
I want the tin mans heart toooo. And a flying monkey!
I want the box found in the wall in Shawshank Redemption.
I’d love Tara, from GWTW.
I’d like Sonny from I, Robot.
I’d like the love from “What Dreams May Come” Also available in handy George Burns and Gracie Allen sizes.
I still want the **Last of the V8 interceptors ** from Mad Max. Unfotuantely George Miller was so short of cash after filming finished, all of the vehicles were sold off since noone gave any thought to their future value. It would be worth a motza now!
Is this the car you mean? Don’t give up hope just yet…
Uncle Buck’s bowling ball.
From TV, I would like the “disturbingly realistic” Norseman head from Freaks and Geeks.
A couple of paintings:
The painting of a GI holding a baby by the foot in one hand and a rifle in the other while he’s standing on one leg with his other foot behind his head in front of an exploding jeep (IIRC) from Airplane!
and
The painting in **Vertigo ** of the painting of the fancy Spanish lady in the museum with Jimmy Stewart’s girlfriend’s head in place of the original.
that’s all!
I want the "time machine-from “THE TIME MACHINE”; also, that hot B+W bikini that ursula Andress wore in “THUNDEBALL”. i’d also like the maltese falcon form “THE MALTESE FALCON”!
Natasha Henstridge from Species
Due to the popularity of the movie, they’ve put the “Red Swingline” back into production. You can get your own here:
http://www.thinkgeek.com/homeoffice/gear/61b7/
TPS Reports are not included.
Nobody but me wants the Ruby Slippers?
I’d also take the diamond necklace from “The Diamond Necklace Affair” before it was cut up…maybe it was too ostentatious for Marie Antoinette, but not for ME!
Hmmm, wonder if b/f would like me naked except draped in the above two items…luxurious!
–Beck
You should have asked for the rug, man… It just brings the room together…