I have the 18-135 and like it just fine. Wow, this thing does a lot. If I could only have one lens, this would be it (but I have about 8 and am very fond of primes).
The thing is, if you would appreciate only carrying one object, not changing lenses, not needing something to keep the other lens safe in, and always being ready to cover this wide range when the moment calls for it, the single zoom wins.
The nicest camera in the world is the one that you have available and prepared the moment you need it.
