KK or Thomson - for foreigner's baby delivery ?

We are foreigners living in Singapore (Not drawing a big fat salary). My company doesn't cover maternity insurance for my wife. We have been doing our monthly checkups at KK until 8th month of pregnancy. But for delivery some friends are suggesting that KK bills can be very expensive for Foreigners baby delivery. And some say that Thomson is better for foreigners who don't have insurance coverage. If the treatment, care for baby and mother, etc are same between these 2 hospitals, then can any of you advise about which hospital is better cost wise. Approximately how much would be the bill for Foreigner's normal delivery ? We are very confused about which hospital is cost effective. Please advise