Home made chili powder mix

I have been searching for a good home made chili powder mix recipe.

Here's the one I'm currently using:

Medium Hot Chili Powder Mix

5 Tbs ground New Mexico chili's
2 Tbs ground sweet paprika
2 Tbs ground cumin
2 Tbs ground granulated garlic powder
2 Tbs ground granulated onion powder
1 tsp ground Mexican oregano
3/4 tsp ground cayenne pepper

Mix well. Makes about 3/4 cup.

My wife likes milder chili powder, so I decrease the cayenne to 1/4 tsp for milder.

Anyone have ideas to improve this recipe or their own recipe for chili powder?

Thanks.