I agree with all of the Prada ambers mentioned. But for an even lighter take on amber from that house, check out their new Luna Rossa.
Lavender is the star attraction here, but the dry down contains a very light version of Prada's signature amber accord. I picked up a bottle of this today at Macy's. Pure class in a bottle, I really love it. I could see this becoming my signature scent this spring. Those other Prada's are legendary, of course, but they were always a just too heavy on the amber for me.