It's something I would never sell either, that's one scarce piece.
If your intent on selling, I would try the Bay as Vick says, with a silly price but open to offers, just to see where you lie with it. I wouldn't worry about missing Bruces auction as things like that will never drop in value. A private deal with some/one of the high profile Star wars collectors would be the way to go to get you the best price, you just need to let them know it's out there for sale..
Good luck with it Mike, I'd buy it myself, but I'm sure your after much more than I could pay you...