My very sincere thanks for the very speedy response - it must be early morning with you.
I am pleased that my private thoughts on the quote about 16 lenses is matched by others. I have read many sound reports on other lenses being extreemly good and was sceptical when I read this comment. Hence me seeking the experience of others. Perhaps the question should really be what lens should be avoided?
So far I have been very happy with my choices of kit and will take a good look at those lenses you suggest. I am very unlikely to create very many huge enlargements despite my wife pressing for some framed images,and therefore I am much more concerned about a robust lens that assists me achieve a good light and exposure balance than absolute pin-sharpness.