chengy,
Yes, 每個牌子都買嚟試下啦. My sister-in-law's friend sent her son to daycare. The baby did not want to drink from bottle and refuse to eat everyday, just cried until the mom went to pick him up after work.
It may take you so long and so much money to find the nipple the baby likes but baby will be more happy and less fussy. You can try to see if Playtex Natural Nurser is available in HK or not. I heard that this nipple is also designed like human breast. But, it pairs with drop-in liner which is disposable and need a new one for every feeding. The good thing is less gas and convenient with cleaning required. The bad side is money. Check this website and take a look of the bottle
http://www.playtexproductsinc.com/infant/bottleFeeding_nurser.asp
Otherwise, I can help you to buy The First Year Breastflow bottle here (San Francisco) and mail to you. The price for a bottle (either 5oz or 9oz) is $4.99 + 8.5%tax here. Let me know if you need help.
花旗太太生活在花旗國,留意時差,你問我未必即時答到。