Try something from Beyond Therapy by Christopher Durang! Great Comedy.
This is one of my all time favorites
Free to Be, You and Me - Ladies First - YouTube
Marlo Thomas from Free to be You and Me. An oldie but a goodie.
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Okay, so I picked out a few monologues and I want to know what are your opinions? I've put the links here:
A Leap Year Leap
Comedic Female Monologue - Mrs. Santa Claus Monologue
Scuba Lessons: Kelly's Monologue
Laughing Wild – by Christopher Durang | jeffmilner.com
I think I may be leaning towards the first one. I really like the last one, but it's really popular and there's always a risk with doing something that's been heard before.