Rebecca, just a word of warning on Deggi Mirch. Its a great chilli powder for curries, and adds a nice red color.
It is however, pretty mild compared to the "hot" and "extra hot". For example, if you were to make a Madras that called for a tsp of chilli powder, and you used deggi mirch, the end result would be on the mild side.
You would need to add extra Deggi, or mix it with some extra hot.