Look at what you have and think about what it needs - animation? Sound? A nice "filler" piece? While I liked the Morgue for all of the animation, we already have some major action going on with the Mauselium (sp?) and other pieces. So I went with the Phantom Station. Lots of nice detail and lights, but doesn't distract.
Its like painting or landscaping, your eyes need somewhere to rest.
I agree with the "theme" advice as well.

Let us know what you finally decided upon!