Lighter Broccoli, Grape and Pasta Salad

bow-tie pasta (, cooked to al dente according to directions listed on package)

lbs broccoli (, crowns chopped into small pieces and majority of stems discarded or reserved for another use (about 4 cups))

low-fat or non-fat plain Greek yogurt ((I used Chobani non-fat))

mayonnaise ((full fat))

red wine vinegar

light agave nectar

salt

chopped red onion

grapes (, chopped into halves)

toasted pecans (, chopped)

slices bacon (, cooked and chopped)