I guess if you looking for an HDB to rent it would be cheaper than private condominium (i have no idea how much though).

Mind you during my past life in Singapore ... i work in local hotel ... my work mate only earn 1.100 SGD ... with 3 kids in tow ... they are surviving.

Try to post your question here :

http://britishexpats.com/forum/forumdisplay.php?f=59

I think you will have more up to date answer. :-) Good luck!