I don't know much about bird or wildlife photography but I do have the 300 f2.8 VR. Its a perfect lens, fast sharp and focuses quickly/accurately. The tiny bit I know about bird photography is... often a lens is used at its widest aperture to increase shutter speed preserving sharpness for your movable subject and to blur the background. These attributes come from a fast lens with wide aperture hence the f2.8 would be good. I dont think VR is going to be worth it for you but again I am no birder so cannot really comment.
Take a look at the number of blades the diaphram has, the more the better the background out of focus region will appear (Bokeh).
Perhaps the 400 f2.8 might be ideal so definately worth waiting for.
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