I am going to get 55-300 or 70-300 in next 2-3 months
Please read the below review of those two tele lens. Hope, This helps to finalize your requirement. I am also re-thinking about tele lens..in my budget, I can get only 55-200mm or 55-300mm VR lens

can't afford 70-300mm VR. How is the AF at 200mm on 55-200mm VR?
I am now concerned about the AF for 55-300 as that review says
"Autofocus is slow.
At 300mm, if you're way out of focus, you may have to try a couple of times to get the camera to wake up and focus. This is because you can get so far out of focus at 300mm that the camera has no idea what's going on, since the image becomes just one big blur. If this is a problem, focus on something else halfway to your intended subject to get the camera sort of in focus, and then it ought to focus the rest of the way to the subject next time you hit the shutter."
Nikkor 55-300mm VR
Nikkor 70-300mm VR