I've used the yellow taxis several times and never had a problem with the driver using the meter (but I clarify that as soon as I get in.)
If I recall correctly, I was charged 115 pesos from the airport to the Five Star Bus terminal at around 0500 hours.
Not all busses go by Dau now, some stop at Marquee Mall. The drivers/conductors are very helpful, so tell them you want to be let off at Dau. If they don't pass by there, ask them to let you off at the Marquee Mall jeepny terminal. A trike for there to Fields will cost you 250 pesos- so I'm told. A trike for Dau to Fields should be about 100 pesos, depending on your negotiating skills.
Enjoy!