thought I just recommend this site
http://www.nissanrentacar.com
more for first timers going to manila and who are not getting picked up my their mahal's and need transport from the airport
it cost me 610pesos to go to Quezon City
I know thats more than a metered taxi but as it was my first time there thought it would be my best option(plus I was under orders from Jonalyn not to get metered one with out her)