Matt, you might be surprised to learn that the Heart of the Ocean necklace is STILL the biggest seller at the Titanic museum in Orlando. They can't keep them on the display shelf! There is a new model of Titanic, similar in many ways to the one Steve Santini designed to demonstrate how the Titanic sank. This one is motorized and does not sink. Other than that, it looks like Steve's model in every way.
Darren, I believe the pieces of Titanic coal, will remain one of the most sought after items of memorabilia, and the larger the piece, the more valuable. Also collectible will be the china and crystal, as being some of the most identified pieces of memorabilia. Newspaper reproductions also still sell quite well. Original photographs and artwork also remain popular.
Kyrila