What would be your ideal mode configuration on a flashlight?

I would buy it in a sec, if it came in a 16340 format(and less than 20$). I hesitated from one of the crapy colored AAA's (9modes...... uuuuhhhhhhh! ) and the new MX4 XR-E R2 4-Mode. Bought the black one.

Don't like AA lighs.