For the most complex flavor, use a good quality blue cheese like Danish blue, Roquefort, or Gorgonzola. The MSG is completely optional—while it enhances the umami quality of the dressing, you'll still get excellent results without it. If you prefer a thinner consistency, simply add 1-2 additional tablespoons of water. For those who enjoy a more pronounced cheese flavor, increase the blue cheese to 3 ounces. The dressing actually improves after sitting overnight in the refrigerator, as this allows the blue cheese flavor to fully permeate the mixture.