Totally this buy a quality crop lens second hand and you won't loose much money and won't have to use a compromise lens for an indeterminate amount of time. For example I'd never recommend a 17-40mm f4l on a crop it's bigger slower and not as good as a lot of the dedicated crop 17-50mm f2.8 lensesPS Don't let what you might possibly maybe inshalla do in the future, i.e., change to full frame, affect the decision as to which lens is best for you at the moment.
The sensible choice. Enjoy.
too late mate new lens here tomorrowWhat about the 17-55 2.8 Or 17-40 f4?