
get a good lens youll use ALL the time like the 24-70 L and then RENT the 100-400 IS for a week or two for the trip.. (or just buy it instead of the 24-70..) the Bigma is also a great choice..50-500MM cant go wrong with that range..as is the siggie 80-400 OS.. stabelized and all!!!
No rentals in Dubai:p
:p
Anyway, im thinking of filling the gap with a cheaper 17-40 L and a Sigma 50 1.8 and alot of accesories (memory cards+filters and so on)