I use to make my own chili powders, and curry powders, but since found commercial ones that I like. They are convenient.
My chili powder blend only consist of about seven ingredients. I can post it or send you a PM; if you like to see it. My version uses only ancho chile peppers, salt (optional) smoked paprika, Mexican oregano, cumin, coriander, garlic powder and onion powder. I use ancho peppers because they have a great taste and mild on heat. If I need to kick up the heat of a dish, I will add a hotter chile pepper powder to the dish; such as habanero powder, or cayenne pepper. I leave out the salt so I can also control that ingredient.