You can alwasys look for all the movies opening in the next few months...choose the ones you like, and buy those. Then once you have them, move on to movies opening further out... It won't take long to use up your all your cash..
Sure, save some $$ to buy IPO's or take advantage of other bonds adjusting, etc., but the further out a movie is opening - usually the cheaper the price. However be cautious about tying up a lot of your $$ in movies opening too away, with a port your size you should be invested in most of the movies opening within the next 6 months, and maybe have some that are further out if you like the big blockbusters.
Even with a port of $100M, you should still think in terms of turn around for your cash, and if you tie up a lot of $$ in a movie that costs you $100/share and opens in 1 year - your $$ might be put to better use with adjusts of movies opening in 2 months...