Well I have been looking at getting a longer lens since my 80-210 Tamron lens is kind of soft. I was wondering what folks suggestions are for the minimum lenth for a good lens for birding/wildlife. I am shooting a d70s so I get the 1.5x factor. Also am a graduate student without unlimited funds (will be saving up no matter which way I go). My main choices I think are a nikon zoom 70-300 for around 350 (although from what I was seeing the G version got a better rating then the ED version at photodo.com) or the sigma 50-500 which costs almost 3x as much at 950 or so. (all prices in US) Mainly wondering if the 300 will work well or should I just stick it out and save for the 500.