My wife and I will be making a trip to Yellowstone in June. I own a 70-200 VRI lens and a TC 17 E teleconverter. I probably need something a bit longer for the trip. I was thinking about renting either the 300 2.8 VRII or the 200-400 4.0 VRII lens. I am leaning towards the 300 because it is a bit easier to travel with but would be interested in hearing other thoughts. Feel free to suggest a different lens if you think I would be better suited. I am not a professional, just someone who would like to have some memorable photos to enjoy. Thanks in advance.