Low Carb Bacon - Cheddar Cauliflower Soup (phase 2 )

I've been on the South beach diet for over three months now and even though I've only lost twelve pounds, I know that I've lost inches. My clothes are getting baggy and the tummy bulge is goin' down.
I have lost three inches off my hips... but mainly, I'm learning a whole new way of eating.....
I came across this recipe that's really tasty and I would normally not used white flour but it's only two tablespoons as a thickener in the whole recipe that serves eight. 

Low Carb Bacon- Cheddar Cauliflower Soup
 serves: 8
8 slices center-cut bacon, chopped (half used for garnish)
1/2 small onion, chopped OR 1 teaspoon onion powder
1 celery stalk, chopped
2 garlic cloves, minced
salt & pepper
4 cups shredded or grated cauliflower (1/2 large head)
2 Tablespoons water
2 Tablespoons flour
2 cups chicken broth, divided
2 cups 2% milk
3-4 dashes hot sauce (or more or less)
2-1/2 cups (12oz) shredded sharp cheddar cheese, divided (half used for garnish)
2 green onions, chopped (optional)

Clocking in at 265 calories, with 7 grams of carbs and 15 grams of protein per serving

Source: http://iowagirleats.com/2012/09/25/bacon-cheddar-cauliflower-chowder-a-low-