Broccoli Salad

1 head large broccoli (chopped finely)
1 med. sweet red onion (chopped)
1 red pepper (chopped)
1 cup chopped walnuts
½ cup raisins
10 slices bacon, cooked, drained, crumbled
1 can sliced water chestnuts

Dressing
1 cup mayonnaise
¼ - ½ cup sugar
2 TB red wine garlic vinegar
2 TB sour cream