Brilliant! That is a fabulous FP combination. Congrats, and welcome to the big screen club.
Both King Kong and TDK (as well as most high quality BD's) will be stunning in that setup. King Kong has a bit better PQ, but it is a bit heavy on the CG. I preferred TDK's more natural feel.
300 is also awesome on FP systems. Although it is (purposefully) grainy, the scene of young King Leonidas coming into sharp focus out of the background bokeh (blur) on an FP system is just breathtaking. The moonlit wolf scene with the young king will also look spectacular with the RS20's high sequential contrast. I'm sure you will be watching many of your BD's again on the big screen-- it's a whole new experience!
