We used a private car service to take us from Tanah Lot to seminyak and it cost us 120,000 rupees which was slightly more than a regular cab on meter ( 100,000). The driver though spoke good english and was very friendly.
We used him again for an all day journey down to ungasan, karma resorts and around seminyak. He charged us 500,000 or about USd 50 for 8 hours. That seemed to be the average private driver cost around.
Mr. Wayan Suama
mobile: 081 239 60511
office: 0361 831 264
I left something in his car and forgot all about it, he was very apologetic though it was clearly my own fault, drove back to the hotel early next morning to return it. :)