I'm looking for a replacement for my 55-200mm AF-S DX (non-vr) and am considering going with the 70-300mm f/4-5.6 ED. Just wanted to know anyone's experience with this lens, and specifically how would it compare to my 55-200mm? I really like the idea of having the extra 100mm for birds/wildlife (if they're close enough of course), and the build quality definitely looks to be considerably better than the 55-200. Not to mention they're both going for about the same price at the moment (used). I have a tripod to use in situations where I don't have the light to use it handheld. What kind of shutter speeds do you need to be able to handhold at 300mm with no VR?