Thanks, Elliot, to you and to JR1...but my more specific concern is that there seems to be some over-lap or redundancy, if you will, with these three (3) lenses.Thanks to you both!

Hi all, I'm a new contributor to this blog...the proud Secretary of the Camera Club of Oxford Greens (CT)...and a budding photographer trying to learn more to submit better photos. Right now, I'm trying to figure out which lens to keep, save or buy for an upcoming Danube River Cruise.Currently along with my new Nikon D7000 my lens are: 24-120mm f.4; wide angle 17-35mm f2.8 (FX, not DX lens); and an 18-200mm 3.5-5.6? It seems as though there could be more efficiencies here, and shouldn't I have a longer telephoto? Any advice is very much appreciated! Many thanks! Gerry