There are many good curry powders on the market. They vary considerably in flavor, so in choosing one, it is a good idea to sniff it first to make sure it is what you like. Many people like to make their own. It is an interesting procedure. The following combination makes a nice curry but vary the ingredients as you like!
8 pods cardamom (remove seeds from pods and grind)
1-1/2 teaspoons ground ginger
1-1/2 teaspoons ground turmeric
1/2 teaspoon ground jeera (cumin seed)
1/2 teaspoon ground coriander
1/2 teaspoon cinnamon
1/2 teaspoon nutmeg
Mix all ingredients.