your girlfriend sitting on top of it cheering you on. Of course, it is far more effective just to do single rep curls in the squat rack.
Really though, I agree that squat, deadlift and press (overhead and flat back) are cornerstones. I agree that both snatch and the jerk portion of C&J (vs. a stationary overhead press) don't carry the right risk/reward for most people. I do think clean is a good lift, though the program I most recently worked with (high school) did not do single rep maxes on clean for the reasons you mention.