What is the difference between these three circuit breakers?

http://www.homedepot.com/p/Square-D-...9?N=5yc1vZbm16
http://www.homedepot.com/p/Square-D-...6?N=5yc1vZbm16
http://www.homedepot.com/p/Square-D-...6?N=5yc1vZbm16

The middle one has the light, but why the big price jump to the third one?

As far as receptacles go, I understand that you DON'T want a GFCI for the refrigerator because if it trips in error, the food goes bad. For the washer/dryer, I think that one would want a GFCI since it is next to the washer and there is a higher chance of the outlet getting wet (already happened to me once). Should the washer/dryer and stove be on a 20-amp circuit as well?