To get your total cost you need to factor in the Obstatrician's fees (antenatal and delivery), Sonographer, Paediatrician and Anaethetist (if you want epidural or c-section).
Grace Cheung and Lucy Lord (her partner) offer a package to patients who choose to stay in a 4 bed room at the Matilda or Adventist to deliver- in Jan 2010 tht was advertised at HK$36000 and includes the antenatal appointments (with scan each time), the delivery and care whilst at the hospital.
On a PAYG basis, their charges are similar to Patrick Chan ($950 for a check up) and these are monthly until you get past 32 weeks, then go to fortnightly.
I have met Grace once (she was covering for Lucy) and got a good impression of her.
The charges by the hospital are set by the hopsital and dont vary by Obs BUT be aware that your Obs might charge more for the delivery if you take a private room, as may the paediatrician, anaethetist etc.