Hi Guys,Since I got a second hand D3S, I am facing a very big dilemma ... which lens to buy?I have a 50mm/1.8, and I did sell the 18-200 that I used for my D300.I am not the kind traveling with several lenses (except this small 50mm), so I would like one single one. Today, I am hesitating between the following Nikon ones:- 24-70 / f2.8 -> no doubt it is excellent, but price and (too) short zoom are real constraints to me. If the 2 following ones were to be disappointing, then I may make the...