Not sure if it'd worth sending a PC from overseas to Singapore. Had a bad experience with mine which was shipped from Indonesia. Believe the shipping company did not handle it well that the PC just died after it got here

Ended up buying another one. If you're not too picky and if it's only for a home use, I think u should be able to find something for about 1700 Sing Dollars (I paid mine for 1700 after fattening up its RAM to 132meg, it's an HP).
Another thing to consider is that shipping your PC from where you are to here may still be GST (goods and services tax) liable. Was informed that if we received shipment of goods with value of more than SGD 300 then you'll have to pay for the 3% GST (this info was received when the shipping company called me up to arrange for delivery, I suppose it is also valid for used items).