Royal & Sun Alliance not bad.
NTUC quoted me $2,700+ when I wanted to renew my insuance this
year.
But when I checked with Royal & Sun, I was quoted only $1,400+.
A whopping $1,300 difference! 
The terms of the insurance are pretty similar. Moreover, the excess
in Royal & Sun's case was only $400. And I get to choose my own
workshop in case anything happens (touch wood)!