While most experienced cooks can agree — more or less — on basic equipment, the pantry is much more a matter of individual choice. How you cook will determine what you cook, in this case. If you prefer Italian, you're going to want a greater variety of dried pastas and at least a couple of olive oils. If you cook Japanese, you'll be choosier about rice and different kinds of soy sauce. This is my highly personal list of the things I need in my basic pantry.
Light brown sugar
Dried red pepper flakes