We have been to Bali for the last 8 years and have always used the same driver.
We can recommend KETUT SULATRA.
He is a very careful driver. Will take you where ever you wish to go and will recommend the best places to view etc.
Prices are very reasonable.
You can contact him on his mobile 081 239 41359.
Just tell him the hotel you are staying at and the date and time you want him to be there. A very obliging man