What is a mint with pleasant smelling leaves and light purple flowers?

Almost all of the mints I have in my garden ( 6 in all) have pleasant smelling leaves ( cat mint is a bit musky) and of those 4 have some shade of purple flowers, the other two are white and a pinky purple.

I recommend a good gardening book, they often have pictures to help you identify your plant. The size, shape and colour of the leaves are more often what will be the deciding factor in identification.