http://airfares.com.sg is reputable. Several people here have used them (including me).

Also, if you're injterested in going from SIN to places in Malaysia, it's usually cheaper to take Malaysian Air from JHB. There's a bus directly to JHB from S'pore (well, as direct as anything in Malaysia.)
Rich

[This message has been edited by rjh (edited 09-21-2002).]