Well from wikipedia.org
There are 7 human cylon models.
Number Three aka D'Anna Biers
Main article: Number Three
D'Anna Biers first appears as a reporter for the Fleet News Service, and is asked by President Roslin and Commander Adama to create a documentary to help the fleet relate to the hard-working staff on the Galactica.
Number Threes are played by Lucy Lawless.
Number Five aka Aaron Doral
Main article: Aaron Doral
In the miniseries, Doral appears as a public relations worker for the abortive Battlestar Galactica museum.
Number Six
Main article: Number Six (Battlestar Galactica)
The first model explicitly revealed to be a Cylon in the miniseries, Six uses seduction often to her advantage. Other copies have used the names Shelley Godfrey and Gina.
Number Eight aka Sharon Valerii
Main article: Sharon Valerii
Sharon Valerii first appears as a pilot aboard the Galactica. Her true nature as a Cylon was only revealed at the end of the miniseries, and the series quickly establishes that Sharon is a sleeper agent, unaware of her true nature and programmed to carry out attacks on the fleet without her human side realizing what she is doing. She was revealed to be the 8th model in the episode 'Downloaded'.
Leoben Conoy (Cylon Model Number Unknown)
Main article: Leoben Conoy
Leoben first appears as a smuggler at the munitions depot at Ragnar Anchorage. His role appears to be one of manipulation and deceit, skillfully mixing truth with lies.
Simon (Cylon Model Number Unknown)
SimonSimon appears to be a tall, slender, black male with closely cropped or balding hair. He first appears posing as a human physician treating Starbuck for a gunshot wound in what was supposedly a hospital on Caprica. In reality, he was also performing invasive tests on her reproductive organs. After Starbuck begins to suspect Simon's true nature and kills him, she escapes from the facility, her fears confirmed when a second copy of the model greets her on her way.
Simon is played by Rick Worthy.
Brother Cavil (Cylon Model Number 2)
Main article: Brother Cavil
Cavil first appears on Galactica, posing as a priest. His nature as a Cylon is revealed when a second copy appears on Caprica.
Brother Cavill is played by Dean Stockwell
Also, Ronald D. Moore has confirmed in interviews that there are 12 different models of humanoid Cylon, with many copies of each model in existence. So keep your eyes out for the other 5