Anything 80s is red hot and a no brainer right now. So Beetlejuce, Blue Brothers, the original Terminator, Blade Runner, Rambo....time is running out though. The 80s window is closing as a new generation sneaks in, then it's the 90s....Pulp Fiction, Fifth Element, The Matrix.....etc.
The holy grail for every manufacturer though is Harry Potter. I was bored to tears watching the movies, but it's where the big, big money is. I think Zen Pinball (virtual) will get it though.