hope you don't mind if i jump in here...
i don't know how much dr choy charges for her services, but i would highly recommend dr joe chan who delivered my son two months ago. not only are his charges very reasonable for a private doctor (consultation: $600, u/s: $200, vaginal delivery: $20K), his care and bedside manner are excellent.
as a first-time mom, i had tons of questions every time i went for a check-up. dr chan always took the time to answer all of my questions and helped to alleviate any of my concerns. i was always happy to go for my check-ups!
when i finally delivered my boy at adventist hospital, dr chan was wonderful in every respect, including beating me to the hospital at midnight when my water broke, keeping me informed of my labour progress every step, and checking in on me twice a day after delivery.
if you are still looking to change OBGYN, you should absolutely consider dr joe chan (btw, if you prefer a female OBGYN, he shares a practice with his wife, dr cora ngai, who is also highly recommended)