DR TCB - About the TITANIC poster... I've seen that logo/poster a few places... Now I'm just trying to remember where.
Have you tried giving Triton Gallery in NYC a call? They print up almost all the theatre posters, and sell most of them too. That logo is not "listed" on their website currently, but they also have some special items in-store that are not listed on their website. It might be worth a try. They also might be able to do a photo-reproduction of the original poster for you. Not exactly cheap, but...
Here's their website... Info and numbers are all there.
http://www.tritongallery.com*One other place to try - which I'm hesitant to recommend since I just don't like dealing with them in the first place - is Colony Music, also in NYC. They have a nice collection of posters in the store, and who knows... However, their prices are ALWAYS high - even on regular stuff - so....
http://www.colonymusic.com