Big Mike, I hear you loud & clear about the 70-200mm F2.8, but that's beyond my budget though that must be a nice lens. I just can't justify the cost. Part of reason why I think of the 50mm prime F1.8 is relatively cheep and small, so it's more practical where I see myself with the 18-200mm VR simply for convenience at expense of charpness
.I just checked the 70-800mm Tamron, Sigma, they are arround $700-800, which is reasonable in price, but they seem too huge, another inconvenience. These lens may be bigger than my Corgi dogs... but I'll definitely remember your suggestion of these particular Sigma & Tamron (Nikon 70-200 F2.8 is impossible due to the price).