Ok I need some advise. I do a lot of zoo photography and the animals usually are jut beyond reach of my 80-200 lens. I am considering the nikon 70-200 VRII with a 1.4TC or the Sigma 120-300 with a sigma 1.4TC. Nikon does not make a TC for my older 80-200mm lens which I purchased the the 1993 era. I have heard the nikon 70-200 VRII is a top lens. I need some help deciding.As always thank you in advance for all your help.