Correction is always healthy because it will generate buying interest and set the market on course to achieve the next high.
Personally I am not so concern about 10 or 15%, its more of how long this decline will last before the bull comes back again.
Knowing Singapore, I think any crash will be very short live. And if you are seriously in the market for property now, better start shopping before you missed the boat again.
"Never argue with an idiot, or he will drag you down to his level and beat you with experience."