If I was to get 200-400VR for bird photography, what tripod should I be looking at ? I'm interested in Total Weight vs. Tripod Support lbs. Above situation is just an example but I'm interested in how one would approach monopod purchase. Would you go with ~20lbs support monopod and have almost "everything" covered or would you go with something lighter ~5lbs + 25lbs for "heavy dude" occasions. I don't have 200-400 at the moment but I have 70-200VR. Tips , recommendations ?