If you have not done so, go visit the Orchard Towers after 10pm at night.  There are four floor of bars where you can pick and choose from a wide variety of international selection

For Singapore website, you can find a lot with Google. I went to Singapore for four time in total. When I need a girl in Singapore, I usually check the gals on Singapore Happy Massage. I prefer those gals with good reviews cuz I don't wanna take the risk. Hope my info can help you get some ideas.