I am going to disney with my 5d. I have a 600 ex and want a lighter speedlite for portraits on the trip. Just torn because the 270 is small and seems like it will cover with my 24-70 ii. I do like the extra power of the 430 for fighting the outdoor lighting also but double the batteries and much larger. Anyone use the 270 in a similar situation and was happy or should i just lug the 430?