Just got a D80 and took the advice posted here - got an 18-70, 18-200, and 50mm lens. I'd like to have an extreme zoom AF lens for sporting events, etc. and am wondering what the best way to go is. I'm an absolute novice, but seem to have picked up that teleconverters are not a great choice, but I don't see much in Nikon's line past 300mm. All advice is welcome, and price is not a big consideration, although I don't want to be dragging a ten foot lens around. Thanks in advance.