There is no such rank-list of wand-powers... (The Elder Wand is indeed very powerful, but it is not unbeatable, and it keeps putting its current master into deadly danger.)
Voldemortand Harry Potter
Parcel tongue
Snakes
It was LOVE
The power vested in Harry in the movie Harry Potter. This is an example of vested in a sentence.
Robert Pattinson and Jamie Campbell Power
he got his power by eating magical tatti
Professor Sprout is of average power, except in herbology, where she is brilliant.
The story gradually unfolds in later books; it is revealed (mainly in book 5) that there was a prophecy, according to which Harry Potter was the one who had the power to destroy him.
It's either Finite Incantatem! or the Power Offswitch.
dementors
She has the power to change her appearance immediately