well, it depends. SIN has had an enormous cost explosion behind it, but that's only because it was so cheap during the years after the crisis. All in all, it's still comparable to other mega cities on this continent.
If you look closely, you can still get good 3 bedroom apartments for 2500 in Changi, Pasir Ris or Loyang. Very close to the airport.
I lived 3 years in SIN and had my privat car (Toyota Corolla 1.5). I paid about 600$/month for the loan. If I travelled twice per day with a taxi for 10$, I had my car already paid. When I went to town I used my car more than twice per day, if you travel from point to point. It's relatively easy to buy a car (go to Car Supermarket in Eunos), and they have become considerably cheaper (from 45 000$), although still a fortune...
Dani