SINGAPORE EXPATS FORUM
Singapore Expat Forum and Message Board for Expats in Singapore & Expatriates Relocating to Singapore

I used to use this.
You may want to try if it gives free call to your country.

http://www.gizmoproject.com/learnmore-allcallsfree.html

You may also want to factor in other considerations like family/friend supports when you are in Singapore when compared back home.

Also, education can be costly if you plan to send your son to an International School.