Brian, Great summer time dish!!
I have done this using smoked chicken breast. While Ms Seaside does not like dark meat in her chicken salad, I do and sometimes make up a batch using mixed meat from a roasted chicken.

The sour cream/mayo mix gives it a great texture and mild taste!! <img src="http://www.traveltalkonline.com/forums/images/graemlins/dine.gif" alt="" />