Thanks for all of your recommendations.
My quest for a good Chicken Caesar Salad was:
"Everything Pop" food court at Pop Century - Good dressing, chicken and portion size. I was very satisfied. (price was $6.99).
"Mara" at Animal Kingdom Lodge - Tasted like the same dressing as Pop Century. Grilled chicken and croutons were different from those served at Pop but just as good. I think the bowl used was a bit smaller but the portion was still adequate. The price is $6.99
'50's Prime Time Cafe at MGM - Salad was very good. Nothing special (other than the price tag of $12.99)
The above salads were very good but based on the dressing I preferred the Chicken Caesar at Cap'n Jack's at Downtown Disney Marketplace.
The price is $9.99 on the lunch menu. I had it the first day we arrived for lunch and ordered it again for dinner the day before our departure (the "Chicken" Caesar is not on the dinner menu but they were pleased to accommodate my request).
If I ad price/portion to the decision the salad at Pop Century was number one.