Acting : monologue for American Accent by Angela Walters

I am going to LA in November to do some workshops and audition to casting directors. I need to have a monologue preferably in an american accent. I have been searching for so many months and cant find anything for my type. Judging from the last group which went out there, they were looking more for something a bit edgy from us british actors who go out there. Any ideas, something which can show me in a strong light. I have until November to get it spot on, my time is running very very short. Anyone have any suggestions?