I don't really have a signtaure...there are a few that I wear on a regular basis:
Philosophy Falling in Love
Bonne Bell Skin Musk (esp in winter!)
Chanel Chance Eau Fraiche
Christian Dior Miss Dior Cherie
Other faves: Philosophy Inner Grace and Pure Grace
My stand by is Very Irresistable by Givenchy. Newer ones I'm loving right now are Covet by SJP and Euphoria by Ck. But I always go back to Very Irresistable. It's perfect day or night and not to overpowering.