Medium-heat curries
The "madras" is not very well-defined, and covers a lot of curries of many different regions. It is generally used to describe a medium-heat curry. Here are the most popular Madras ingredients.
For serious curry-aholics
The Vindaloo originates from Goa, but the term "Vindaloo" is now used to describe any hot curry. Here are the most popular spices for hot curries.