Since I've lived in Singapore, I've booked lots of different travel arrangements, whether hotel, airline tickets, or whatever. One of the agents I've used on a pretty regular basis is Giamso International. I've booked tour packages, air tickets, and other such things with them. I've generally found the staff helpful and the prices competitive. They are located in Chinatown, where there are a lot of tour agencies, so it is also really easy, if you want to use Giamso, to compare prices with other agencies before deciding.
If you stop by there, you can ask for Kenneth. He mostly does just air tickets, but he is extra helpful.
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