I am looking for something with fairly high optical quality, and I've had my eyes on a variety of 70-200s. My budget is $650, $700 if needed, and if its damn good (a superzoom or VR) $750. I'd prefer an FX lens so I would get a 105-300 instead of a 70-200. I'm going to be using this for bird/wildlife photography. It would also be nice if it fit in my Tamrac Adventure 7. I probably wont have scraped together the dough for this lens until around April-ish, so that's something to consider. So far I've been considering the Sigma 70-200, the Tamron 70-200, the Nikkor 80-200, and if by some miracle it fits in my bag, I find it at the right price, and its optical quality is on par or nearly on par with the 70-200s, the Sigma 150-500 or 120-400. Note that the Tokina 50-135 is not quite long enough for me. Any thoughts on these lenses or other reccomendations?