Big ups for your smooth cauliflower and curry soup suggestions: I have been a serious cauli and curry combo addict and its great to see another afficionado.
I know this will sound a bit out of left field: but try using some very mild madras stile yellow curry, just enough to perfume, not quite enough to effect the finish of the cauli, and add a massive spoon of caviar and a an equally loving spoon of creme fraiche.... the cauli/curry and caviar combination is sublime. Just be sure to pass the soup through a chinois before the caviar thing, the consistency is a little troubling if its not perfect-smooth.