Help please!! I am thinking of adding a Nikon 1.4 or 1.7 TC to my 80-200mm AF-S. I shoot with a D2Hs. I will be shooting kids sports--T-ball, soccer, football. The t-ball that I'm shooting right now is held at 6:00PM, so light is okay but falls off during the game. I'm leaning toward the 1.4 because I understand that the image quality is better and also I would only be giving up one stop. However, the added reach of the 1.7 really does seem like it would be handy. What do you guys and gals think?