How are you traveling? How long will you be going? How many film holders are you willing to carry? and most of all are you willing to change film in the field? After a couple day attack on the La PLatas in SW colorado I realized I hated changing film in the field and if I had the opportunity to do it again it would be quick loads for color and ready loads for BW. But that is just my personal feeling. I'm not real patient. This limits your choices though. Good luck.