BPAL is awesome. The samples sound small, but they're high concentrate perfume oils, and can last months in daily use. This also means that some of the heavier scents can be quite overpowering, so keep that in mind while ordering.
My favourites are Endymion and Dana O'Shee, which are both very light. I can't wear the heavier ones like Zombie during the summer, they just feel too heavy.