Also remember there are some good deals to be had at Singtel if you subscribe to a mobile plan, home land line and internet package at the same time.
I used to be a Singtel magix subscriber which gave me a fixed IP address and a better quality connection ( dedicated node instead of shared) but now have an 8mb plan thats just as good IMHO.
It depends a lot on what you want from your connection really. The upload speeds can be important if you're an online gamer ( these speeds are rarely published by ISP's).
You may want to go to one of many speed test sites to compare Singapore results if it's raw speed you're interested in
http://www.speedtest.net/
Heres my connection results for :-
Singapore
LONDON
NEW YORK
Good luck