On my 705, I use:

Screen 1: total time, total distance, current power (3 sec avg), heart rate, heart rate zone, speed, and time of day, and cadence
Screen 2: lap time, speed, heart rate, current power (3 sec avg), avg lap power

I use screen 1 for most riding, screen 2 for interval work. I'm thinking I might replace HR or speed with cadence on screen 2.